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{{short description|none}} <!-- "none" is preferred when the title is sufficiently descriptive; see [[WP:SDNONE]] -->
{{more citations needed|date=December 2019}}
This article discusses the fictional '''timeline of the ''[[Star Trek]]'' franchise'''. The franchise is primarily set in the future, ranging from the mid-22nd century (''[[Star Trek: Enterprise]]'') to the late 24th century (''[[Star Trek: Picard]]''), with the third season of ''[[Star Trek: Discovery]]'' jumping forward to the 32nd century. However the franchise has also outlined a fictional [[future history]] of Earth prior to this, and, primarily through [[time travel]] plots, explored both past and further-future settings.

The chronology is complicated by the presence of divergent timelines within the franchise's narrative, as well as internal contradictions and [[retcon]]s. The [[Star Trek: The Original Series|original series]] generally avoided assigning real-world dates to its futuristic setting, instead using the [[stardate]] system. Series from ''[[Star Trek: The Next Generation]]'' onwards defined their temporal settings in conventional form.

==Series, books, and film settings==
This table shows each TV series and movie, its year of release or broadcast, the year it was set in according to the prevailing Okuda chronology (see below), and the [[stardate]] range for that year. The designation ''[[Starship Enterprise|Enterprise]]''-based series are the series that featured the various incarnations of the starship USS ''Enterprise''. In universe timeline chronological order ''[[Star Trek: Enterprise]]'' (ENT), ''[[Star Trek: The Original Series]]'' (TOS), ''[[Star Trek: The Animated Series]]'' (TAS), ''[[Star Trek: The Next Generation]]'' (TNG), and all 13 of the ''Star Trek'' feature films, including the three newest [[J. J. Abrams]] "reboot" films, or "Kelvin Timeline" based on the original series.{{citation needed|date=December 2019}}

{| class="wikitable"
|-
!Year
!Stardates
!''Enterprise'', ''Strange New Worlds'', ''The Original Series'', ''The Next Generation'', ''Picard'', original timeline films, major events
! Animated series
! Novels and comics
!''Deep Space Nine''
!''Voyager''
!''Discovery''
!Reboot films (Kelvin timeline)
!Video games
|-
|Before the birth of the Universe
|
|
|
|
|
|"[[Death Wish (Star Trek: Voyager)|Death Wish]]" (1996)
|
|
|
|-
|3.5 billion years ago
|
|''The Next Generation'' "[[All Good Things... (Star Trek: The Next Generation)|All Good Things...]]" (1994) [primordial Earth]
|
|
|
|
|
|
|
|-
|~2840 [[BCE]]
|
|''Star Trek'' "[[All Our Yesterdays (Star Trek: The Original Series)|All Our Yesterdays]]" (1969) [primary plotline]
|
|
|
|
|
|
|
|-
|1893 [[Common Era|CE]]
|
|''The Next Generation'' "[[Time's Arrow (Star Trek: The Next Generation)|Time's Arrow]]" (1992) [primary plotline]
|
|
|
|
|
|
|
|-
|1930
|
|''Star Trek'' "[[The City on the Edge of Forever (Star Trek: The Original Series)|The City on the Edge of Forever]]" (1967) [primary plotline]
|
|
|
|
|
|
|
|-
|1944
|
|''Enterprise'' "[[Storm Front (Star Trek: Enterprise)|Storm Front]]" (2004) [primary plotline]
|
|
|
|
|
|
|
|-
|1947
|
|
|
|
|"[[Little Green Men (Star Trek: Deep Space Nine)|Little Green Men]]" (1995) [primary plotline]
|
|
|
|
|-
|1957
|
|''Enterprise'' "[[Carbon Creek (Star Trek: Enterprise)|Carbon Creek]]" (2002) [primary plotline]
|
|
|
|
|
|
|
|-
|1968
|
|''Star Trek'' "[[Assignment: Earth]]" (1968) [primary plotline]
|
|
|
|
|
|
|
|-
|1969
|
|''Star Trek'' "[[Tomorrow Is Yesterday]]" (1967) [primary plotline]
|
|
|
|
|
|
|
|-
|1986
|
|''[[Star Trek IV: The Voyage Home|The Voyage Home]]'' (1986) [primary plotline]
|
|
|
|
|
|
|
|-
|1992–1996
|
|[[The Eugenics Wars: The Rise and Fall of Khan Noonien Singh|Eugenics Wars]] (2001–2002)
|
|''Khan'' [secondary plotline]
|
|"[[Future's End (Star Trek: Voyager)|Future's End]]" (1996) [primary plotline]
|
|
|
|-
|2000
|
|
|
|
|
|"[[11:59 (Star Trek: Voyager)|11:59]]" (1999) [primary plotline]
|
|
|
|-
|2004
|
|''Enterprise'' "[[Carpenter Street (Star Trek: Enterprise)|Carpenter Street]]" (2003) [primary plotline]
|
|
|
|
|
|
|
|-
|2022
|
|''Strange New Worlds'' "[[Tomorrow and Tomorrow and Tomorrow (Star Trek: Strange New Worlds)|Tomorrow and Tomorrow and Tomorrow]]" (2023) [primary plotline]
|
|
|
|
|
|
|
|-
|2024
|
| ''[[Star Trek: Picard|Picard]]'' season 2 (2022) [past timeline]
|
|
|"[[Past Tense (Star Trek: Deep Space Nine)|Past Tense]]" (1995) [primary plotline]
|
|
|
|
|-
|2032
|
|
|
|
|
|"[[One Small Step (Star Trek: Voyager)|One Small Step]]" (1999) [primary plotline]
|
|
|
|-
|2049–2053
|
|World War III
|
|
|
|
|
|
|
|-
|2054–2079
|
|Post-atomic horror
|
|
|
|
|
|
|
|-
|2063
|
|''[[Star Trek: First Contact|First Contact]]'' (1996) [primary plotline]
|
|
|
|
|
|
|
|-
|2151–2152
|
|''[[Star Trek: Enterprise|Enterprise]]'' season 1 (2001–2002)
|
|
|
|
|
|
|
|-
|2152–2153
|
|''Enterprise'' season 2 (2002–2003)
|
|
|
|
|
|
|
|-
|2153–2154
|
|''Enterprise'' season 3 (2003–2004)
|
|
|
|
|
|
|
|-
|2154–2155
|
|''Enterprise'' season 4{{ref|1|1}} (2004–2005)
|
|
|
|
|
|
|
|-
|2156–2160
|
|Earth–Romulan War
|
|
|
|
|
|
|
|-
|2161
|
|''[[Star Trek: Enterprise|Enterprise]]'' "[[These Are the Voyages...]]" (2005) [[holodeck]] simulation of the events{{ref|2|2}}<br>Founding of the [[United Federation of Planets]]
|
|
|
|
|
|
|
|-
|2164
|2164 (Reboot Stardate)
|
|
|
|
|
|
|USS ''Franklin'' goes missing: ''[[Star Trek Beyond]]'' (2016)
|
|-
|2233
|2233 (Reboot Stardate)
|
|
|
|
|
|
|''[[Star Trek (2009 film)|Star Trek]]'' (2009){{ref|3|3}} [prologue]
|
|-
|2233–2258
|2233–2258 (Reboot Stardates)
|
|
|''[[Star Trek: Nero|Nero]]'' comics
|
|
|
|
|
|-
|2245–2250
|
|The ''Constitution''-class USS ''Enterprise'' (NCC-1701) is launched under the command of Captain Robert April and begins its first 5-year mission.
|
|
|
|
|
|
|
|-
|2254
|
|''Star Trek'' "[[The Cage (Star Trek: The Original Series)|The Cage]]" (1964)
|
|
|
|
|
|
|
|-
|2256–2257
|1207
| Klingon-Federation War
|
|
|
|
|''[[Star Trek: Discovery|Discovery]]'' season 1 (2017–2018)<ref>{{cite web|url=https://screenrant.com/strange-new-worlds-star-trek-discovery-klingon-sequel/|title=Strange New Worlds Finally Gives Star Trek Discovery's Klingon War A Sequel|publisher=[[Screen Rant]]|author=Orquiola, John|language=en-US|url-status=live|date=June 17, 2023|access-date=November 13, 2023|archive-date=November 13, 2023|archive-url=https://archive.today/20231113203030/https://screenrant.com/strange-new-worlds-star-trek-discovery-klingon-sequel/}}</ref>
|
|
|-
|2258–2259
|2258–2259 (Reboot Stardate)
|
|
|
|
|
|''[[Star Trek: Discovery|Discovery]]'' season 2 (2018–2019)
|''[[Star Trek (2009 film)|Star Trek]]'' (2009)
|
|-
|2259
|2259 (Reboot Stardate)
|''[[Star Trek: Strange New Worlds]]'' season 1 (2022) and season 2 (2023)
|
|''Khan'' [primary plotline]
|
|
|
|
|
|-
|2259–2260
|2259–2260 (Reboot Stardate)
|
|
|
|
|
|
|''[[Star Trek Into Darkness]]'' (2013)
|
|-
|2263
|2263 (Reboot Stardate)
|
|
|
|
|
|
|''[[Star Trek Beyond]]'' (2016)
|
|-
|2265
|1000–1499
|''Star Trek'' "[[Where No Man Has Gone Before]]" (1965)
|
|
|
|
|
|
|
|-
|2266–2267
|1500–3299
|''[[Star Trek: The Original Series|Star Trek]]'' season 1 (1966–1967)
|
|
|
|
|
|
|
|-
|2267–2268
|3300–4799
|''Star Trek'' season 2 (1967–1968)
|
|
|"[[Trials and Tribble-ations]]" (1996) [primary plotline taking place within "[[The Trouble with Tribbles]]"]
|
|
|
|
|-
|2268–2269
|4800–5999
|''Star Trek'' season 3 (1968–1969)
|
|
|
|
|
|
|
|-
|2269–2270
|5221–5683
|
|''[[Star Trek: The Animated Series|The Animated Series]]'' season 1 (1973–1974)
|''[[Killing Time (Star Trek novel)|Killing Time]]''
|
|
|
|
|
|-
|2270
|6000–6146
|
|''The Animated Series'' season 2 (1974)
|
|
|
|
|
|
|-
|2273
|7410–7599
|''[[Star Trek: The Motion Picture|The Motion Picture]]'' (1979)
|
|
|
|
|
|
|
|-
|2275
|
|
|
|''[[Spock's World]]''
|
|
|
|
|
|-
|2278
|7818
|USS Bozeman launched: "[[Cause and Effect (Star Trek: The Next Generation)|Cause and Effect]]" (1992)
|
|
|
|
|
|
|
|-
|2285
|8100–8299
|''[[Star Trek II: The Wrath of Khan|The Wrath of Khan]]'' (1982)<br>''[[Star Trek III: The Search for Spock|The Search for Spock]]'' (1984)
|
|
|
|
|
|
|
|-
|2286
|8300–8399
|''[[Star Trek IV: The Voyage Home|The Voyage Home]]'' (1986)
|
|
|
|
|
|
|
|-
|2287
|8400–8499
|''[[Star Trek V: The Final Frontier|The Final Frontier]]'' (1989)
|
|
|
|
|
|
|
|-
|2293
|9500–9999
|''[[Star Trek VI: The Undiscovered Country|The Undiscovered Country]]'' (1991)<br>''[[Star Trek Generations|Generations]]'' (1994) [prologue]
|
|
|
|"[[Flashback (Star Trek: Voyager)|Flashback]]" (1996) [flashback taking place within ''[[Star Trek VI: The Undiscovered Country|The Undiscovered Country]]'']
|
|
|
|-
|2298–2364
|
|
|
|''[[Star Trek: The Lost Era|The Lost Era]]'' novels
|
|
|
|
|
|-
|2324
|1292.4
|''[[Star Trek: Section 31]]'' (2025)
|
|
|
|
|
|
|
|-
|2333–2355
|10000–32999
|
|
|''[[Star Trek: Stargazer|Stargazer]]'' novels
|
|
|
|
|
|-
|2354–2381
|31000–58999
|
|
|''[[Star Trek: New Frontier|New Frontier]]'' novels
|
|
|
|
|
|-
|2364
|41000–41999
|''[[Star Trek: The Next Generation|The Next Generation]]'' season 1 (1987–1988)<br>''The Next Generation'' "[[All Good Things... (Star Trek: The Next Generation)|All Good Things...]]" (1994) [past timeline]
|
|
|
|
|
|
|
|-
|2365
|42000–42999
|''The Next Generation'' season 2 (1988–1989)
|
|
|
|
|
|
|
|-
|2366
|43000–43999
|''The Next Generation'' season 3 (1989–1990)
|
|
|
|
|
|
|
|-
|2367
|44000–44999
|''The Next Generation'' season 4 (1990–1991)
|
|
|"[[Emissary (Star Trek: Deep Space Nine)|Emissary]]" (1993) [flashback to the Battle of Wolf 359]
|
|
|
|
|-
|2368
|45000–45999
|''The Next Generation'' season 5 (1991–1992)
|
|
|
|
|
|
|
|-
|2369
|46000–46999
|''The Next Generation'' season 6 (1992–1993)
|
|
|''[[Star Trek: Deep Space Nine|Deep Space Nine]]'' season 1 (1993)
|
|
|
|
|-
|2370
|47000–47999
|''The Next Generation'' season 7 (1993–1994)<br>''[[Star Trek: Enterprise|Enterprise]]'' "[[These Are the Voyages...]]"{{ref|4|4}} (2005) [main timeline]
|
|''[[Q-Squared]]''
|''Deep Space Nine'' season 2 (1993–1994)
|
|
|
|
|-
|2371
|48000–48999
|''[[Star Trek Generations|Generations]]'' (1994)
|
|
|''Deep Space Nine'' season 3 (1994–1995)
|''[[Star Trek: Voyager|Voyager]]'' season 1 (1995)
|
|
|
|-
|2372
|49000–49999
|
|
|
|''Deep Space Nine'' season 4 (1995–1996)
|''Voyager'' season 2 (1995–1996)
|
|
|
|-
|2373
|50000–50999
|''[[Star Trek: First Contact|First Contact]]'' (1996)
[[Dominion War]]
|
|
|''Deep Space Nine'' season 5 (1996–1997)
|''Voyager'' season 3 (1996–1997)
|
|
|
|-
|2374
|51000–51999
|[[Dominion War]]
|
|
|''Deep Space Nine'' season 6 (1997–1998)
|''Voyager'' season 4 (1997–1998)
|
|
|
|-
|2375
|52000–52999
|[[Dominion War]]
''[[Star Trek: Insurrection|Insurrection]]'' (1998)
|
|
|''Deep Space Nine'' season 7 (1998–1999)
|''Voyager'' season 5 (1998–1999)
|
|
|
|-
|2376
|53000–53999
|
|
|''[[A Stitch in Time (Robinson novel)|A Stitch in Time]]''
|
|''Voyager'' season 6 (1999–2000)
|
|
|
|-
|2377–2378
|54000–55599
|
|
|
|
|''Voyager'' season 7 (2000–2001)
|
|
|
|-
|2378–2379
|55600–56399
|
|
|''[[Star Trek: A Time to...|A Time to...]]'' novels
|
|
|
|
|
|-
|2379
|56400–56899
|''[[Star Trek Nemesis|Nemesis]]'' (2002)
|
|
|
|
|
|
|
|-
|2380
|57000–57999
|
| ''[[Star Trek: Lower Decks|Lower Decks]]'' season 1 (2020)
|
|
|
|
|
|
|-
|2381
|58000–58999
|
| ''[[Star Trek: Lower Decks|Lower Decks]]'' season 2 (2021), season 3 (2022), and season 4 (2023)
|
|
|
|
|
|
|-
|2379–2386
|56900–63999
|Utopia Planitia Shipyards, ''[[Star Trek: Picard|Picard]]'' season 1 (2020)
|
|''[[Star Trek: Titan|Titan]]'' novels
|
|
|
|
|
|-
|2383
|
|
| ''[[Star Trek: Prodigy|Prodigy]]'' season 1 (2021)
|
|
|
|
|
|
|-
|2385
|
|Utopia Planitia Shipyards Destruction, ''[[Star Trek: Picard|Picard]]'' Season 1, Episode 2 (2020)
|
|
|
|
|
|
|
|-
|2387
|64000–64999
|''[[Star Trek (2009 film)|Star Trek]]'' (2009) [flashback]
|
|''[[Star Trek: Countdown|Countdown]]''
|
|
|
|
|
|-
|2390
|
|
|
|
|
|"[[Timeless (Star Trek: Voyager)|Timeless]]" (1998) [future timeline]
|
|
|
|-
|2395
|72000–72999
|''[[Star Trek: The Next Generation|The Next Generation]]'' "[[All Good Things... (Star Trek: The Next Generation)|All Good Things...]]" (1994) [future timeline]
|
|
|
|
|
|
|
|-
|2399
|76000–76999
|''[[Star Trek: Picard|Picard]]'' season 1 (2020)
|
|
|
|
|
|
|
|-
|2401
|78183
|''[[Star Trek: Picard|Picard]]'' season 2 (2022) [main timeline] and season 3 (2023)
|
|
|
|
|
|
|
|-
|2404
|
|
|
|
|
|"[[Endgame (Star Trek: Voyager)|Endgame]]" (2001) [future timeline]
|
|
|
|-
|2409-2411
|
|
|
|
|
|
|
|
|[[Star Trek Online]] (2010)
|-
|2450
|
|
|
|
|"[[The Visitor (Star Trek: Deep Space Nine)|The Visitor]]" (1995) [future timeline]
|
|
|
|
|-
|2554
|
| ''[[Star Trek: Enterprise|Enterprise]]'' "Azati Prime" (2004) [Battle of Procyon 5]
|
|
|
|
|
|
|
|-
|2875
|
|
|
|
|
|"[[Relativity (Star Trek: Voyager)|Relativity]]" (1999) [future timeline]
|
|
|
|-
|3052
|
|''Enterprise'' "[[Shockwave (Star Trek: Enterprise)|Shockwave]]" (2002) [future timeline]
|
|
|
|
|
|
|
|-
|3069–3089
|
| The Burn, followed by the collapse of most of the United Federation of Planets
|
|
|
|
|
|
|
|-
|3074
|
|
|
|
|
|"[[Living Witness (Star Trek: Voyager)|Living Witness]]" (1998)
|
|
|
|-
|3186
|
|
|
|
|
|
|"The Red Angel" (2019)
|
|
|-
|3188-89
|
|
|
|
|
|
|''[[Star Trek: Discovery|Discovery]]'' season 3 (2020)
|
|
|-
|3190
|
|
|
|
|
|
|''[[Star Trek: Discovery|Discovery]]'' season 4 (2021–22)
|
|
|-
|3191
|
|
|
|
|
|
|''[[Star Trek: Discovery|Discovery]]'' season 5 (2024)
|
|
|-
|43rd century
|
|
|
|
|
|
|"Calypso" (''Short Treks'', 2018)
|
|
|}

===Timeline in order of series air dates===
{{Timeline of Star Trek franchise}}

==Chronology and events==
This timeline is based on the ''Star Trek Chronology'' model described below, supplemented by data from the website [[startrek.com]].<ref name=okuda /> The Timeline also consists of before, between, and after those events.

Note: Many of these dates are rounded-off approximations, as the dialog from which they are derived often includes qualifiers such as "over," "more than," or "less than."

{{Panorama
|image   = File:Star Trek Timelines.png
|height  = 350
|alt     = Star Trek Timelines
|caption = Overview about the most important events, first contacts and when series/movies of the Star Trek universe take place
}}

===Before Common Era===
* The [[Big Bang]]
** Quinn hides in the Big Bang to avoid discovery by [[Q (Star Trek)|Q]].<ref>[[Death Wish (Star Trek: Voyager)]]</ref>
* c. 6 billion years ago
** The [[Guardian of Forever]] is formed.<ref>The Guardian notes in the episode "[[The City on the Edge of Forever]]" that it has existed "since before [[sun|your sun]] burned hot in space".</ref>
* c. 4 billion years ago
** A humanoid civilization seeds the oceans of many planets with genetic material, which would lead to the development of humanoids on many planets.<ref>This event is the key plot point of "[[The Chase (Star Trek: The Next Generation)|The Chase]]".</ref>
* c. 65 to 100 million years ago
** The dinosaurs (the Voth civilization) from the episode "[[Distant Origin]]" are most likely descendants of [[Hadrosauridae]] who lived in the [[Cretaceous]] period of Earth's history.
* c. 1 million years ago
** [[Return to Tomorrow|Sargon]]'s people explore the galaxy and colonize various planets, possibly including [[Vulcan (Star Trek)|Vulcan]].<ref>Established in the episode "[[Return to Tomorrow]]".</ref>
* c. 600,000 years ago
** The [[The Last Outpost (Star Trek: The Next Generation)|Tkon Empire]], an interstellar state consisting of dozens of star systems in the [[Alpha Quadrant]], becomes extinct.
* c. 200,000 years ago
** The [[Iconian]] civilization is destroyed.
* c. 8,000 BCE
** The [[Dominion (Star Trek)|Dominion]] may have been founded in the Gamma Quadrant by the shapeshifting race known as the [[Changeling (Star Trek)|Changelings]] around this time, possibly in a different form than is known in the modern timeline.<ref>Weyoun states that the Dominion is approximately 10,000 years old in the seventh season episode "[[The Dogs of War (Star Trek: Deep Space Nine)|The Dogs of War]]".</ref>
* c. 2700 BCE
** A group of extraterrestrial beings land on Earth and are eventually known as the Greek gods, as established in the episode "[[Who Mourns for Adonais?]]".

===1st millennium of the Common Era===
* c. 4th century CE
** The [[Vulcan (Star Trek)|Vulcan]] Time of Awakening. In the midst of horrific wars on Vulcan, the philosopher Surak leads his people, teaching them to embrace logic and suppress all emotion.<ref>The seventh-season TNG episode "[[Gambit (Star Trek: The Next Generation)|Gambit]]" says this was around 2,000 years before.</ref> Those who refuse to follow Surak leave the Vulcan system and eventually colonize [[Romulan|Romulus]]. ("[[Awakening (Star Trek: Enterprise)|Awakening]]" (ENT), "[[Balance of Terror]]" (TOS))
** The [[Dominion (Star Trek)|Dominion]] may have been founded in the Gamma Quadrant by the shapeshifting race known as the [[Changeling (Star Trek)|Changelings]] (Founders) around this time.<ref>Weyoun says the Dominion is 2,000 years old in the fourth-season DS9 episode "[[To the Death (Star Trek: Deep Space Nine)|To the Death]]". Possibly this was a time of change or reform for the Dominion, transforming it from a previous incarnation into the version seen in the series.</ref>
* c. 9th century
** [[Kahless]] the Unforgettable unites the Klingons by defeating the tyrant Molor in battle, and provides his people with teachings based on a philosophy of honor.<ref>The sixth-season TNG episode "[[Rightful Heir]]" said this event was 1,500 years ago)</ref>

===Pre-20th century===
* c. 1505
** The [[Borg]] are known to exist in the Delta Quadrant, 900 years prior to Voyager landing on the planet as referenced by the Vaadwaur "[[Dragon's Teeth (Star Trek: Voyager)|Dragon's Teeth]]" (VOY).
* c. 1570
** The ancient [[Bajoran]]s use [[solar sail]] ships to explore their [[star system]], and one may have reached [[Cardassian|Cardassia]].<ref>800 years before the third-season ''DS9'' episode "[[Explorers (Star Trek: Deep Space Nine)|Explorers]]"</ref>
* 18th century
** The [[Suliban]] homeworld becomes uninhabitable ("[[Detained (Star Trek: Enterprise)|Detained]]" (ENT)).
** The Preservers transport various [[Native Americans in the United States|Native American]]s to a faraway planet.<ref>The ''Chronology'' dates this by the culture seen in the episode which features the transplant, ''[[The Paradise Syndrome]]''</ref>
* c. 1864
** The Skagarans abduct humans for use as slaves in their colony world (as referred to in ''Enterprise'' Season 3: "[[North Star (Star Trek: Enterprise)|North Star]]").
* c. 1871
** The [[Cardassian|Cardassian Union]] is established.<ref>[[Dukat (Star Trek)|Gul Dukat]] says this happens five centuries before the third-season DS9 episode ''[[Defiant (Star Trek: Deep Space Nine)|Defiant]]''</ref>
*   1888
**  August 31: [[Jack the Ripper]]'s first victim is found murdered and mutilated in [[East London]] (as referred to in ''Star Trek:  The Original Series'' Season 2:  "[[Wolf in the Fold]]").
* c. 1893
** "[[Time's Arrow (Star Trek: The Next Generation)|Time's Arrow]]" (TNG).

===20th century===
* 1918
** [[World War I]] ends with 6 million dead ("[[Bread and Circuses (Star Trek: The Original Series)|Bread and Circuses]] (TOS)").
* 1930
** Social activist Edith Keeler dies in a traffic accident in New York. In an alternate timeline where she lives, she becomes the leader of a peace movement that indirectly leads to [[Nazi Germany]] winning [[World War II]]. ("[[The City on the Edge of Forever]]" (TOS)).
* 1937
** Several hundred humans are secretly abducted by an alien race known as the Briori and brought to the [[Delta Quadrant]]. Eight are cryogenically frozen, including long-lost pilot [[Amelia Earhart]] ("[[The 37's]]" (VOY)).
* 1944 (alternate timeline)
** In an alternate timeline caused by incursions from the [[Temporal Cold War]] of the 27th-31st centuries, Nazi Germany wins [[World War II]] with the help of an alien species called the Na'kuhl. The crew of the starship ''Enterprise'' (NX-01), arriving here from 2153, defeat the Na'kuhl, end the Temporal Cold War and return to their own time. ("[[Storm Front (Star Trek: Enterprise)|Storm Front]]" (ENT))
* 1945
** [[World War II]] ends with 11 million dead ("[[Bread and Circuses (Star Trek: The Original Series)|Bread and Circuses]] (TOS)").
** The [[United Nations]] is established in San Francisco but its headquarters move to [[New York City]].
* 1947
** Three [[Ferengi]] ([[Quark (Star Trek)|Quark]], [[Rom (Star Trek)|Rom]], and [[Nog (Star Trek)|Nog]]) crash land in the New Mexico desert, and are held by the U.S. government at a [[Area 51|secret base]] for scientific study ("[[Little Green Men (Star Trek: Deep Space Nine)|Little Green Men]]" (DS9)).
* 1957
** A Vulcan scout ship visits Earth, according to a story told by T'Pol (presumably a true story as T'Pol examines a purse which was portrayed as used by her great-great-grandmother during the story; see episode entry) ("[[Carbon Creek (Star Trek: Enterprise)|Carbon Creek]]" (ENT)).
* 1967
** [[Captain Braxton]]'s 29th century Federation timeship ''Aeon'' crashlands on Earth ("[[Future's End]]" (Voyager)).
* 1968
** "[[Assignment: Earth]]" (TOS) past events.
* 1969
** "[[Tomorrow Is Yesterday]]" (TOS) past events.
* 1986
** ''[[Star Trek IV: The Voyage Home]]'' past events. Two [[humpback whale]]s are brought forward in time to 2286 in order to repopulate their species after it became extinct.
* 1992
** The [[The Eugenics Wars: The Rise and Fall of Khan Noonien Singh|Eugenics Wars]] (WWIII) begin.<ref name=space_seed>Dates are given in dialogue in "[[Space Seed]]"</ref> At the height of his influence, the genetically augmented tyrant [[Khan Noonien Singh]] is said to be the absolute ruler of more than one-quarter of Earth's population. (WWIII is retconned to be in the 2050s by ''TNG''{{'}}s ''Encounter at Farpoint'' and ''Star Trek First Contact'' and to being a conflict separate from the Eugenics Wars; ''SNW''{{'}}s "Strange New World" retcons it to taking place in the 21st century, prior to WWIII.)
* 1996
** The Eugenics Wars end.<ref name=space_seed /> After Khan's defeat, he and a group of about 80 or 90 Augments steal the sleeper ship SS ''Botany Bay'' and leave the Solar System. ("[[Space Seed]]" (TOS))
** "[[Future's End]]" (VOY).
* 1999
** ''[[V'ger|Voyager 6]]'' is launched.<ref>The ''Chronology'' speculates on the year, noting that ''[[Star Trek: The Motion Picture]]'' does not give an exact figure. However the movie itself does state that ''Voyager 6'' "was launched more than three hundred years ago."</ref>
* 2000
** The past events of "[[11:59 (Star Trek: Voyager)|11:59]]" (VOY).

===21st century===
* 2002
** The interstellar probe ''[[The Changeling (Star Trek: The Original Series)|Nomad]]'' is launched.<ref name=okuda /><ref>The ''Chronology'' speculates on the year, noting the episode "[[The Changeling (Star Trek: The Original Series)|The Changeling]]" does not give an exact figure. However, the episode does have Kirk ask "Wasn't there a probe called Nomad launched in the early 2000s?"</ref>
* 2004
** The past events of "[[Carpenter Street (Star Trek: Enterprise)|Carpenter Street]]" (ENT).
* 2009
** The first successful Earth-Saturn probe takes place.<ref name=okuda /><ref>The ''Chronology'' speculates on the year, noting the episode "[[Tomorrow Is Yesterday]]" does not give an exact year.</ref>
* 2012
** The world's first self-sustaining civic environment, Millennium Gate, which became the model for the first habitat on Mars, is completed in Portage Creek, Indiana ("[[11:59 (Star Trek: Voyager)|11:59]]" (VOY)).
* 2018
** Sleeper ships are made obsolete.<ref>According to the episode "[[Space Seed]]". The year is clearly specified by Lt McGivers, ship's historian.</ref>
* 2022
** The past events of "[[Tomorrow and Tomorrow and Tomorrow (Star Trek: Strange New Worlds)|Tomorrow and Tomorrow and Tomorrow]]" (SNW).
* 2024
** A [[united Ireland]] is achieved (''TNG'' "[[The High Ground (Star Trek: The Next Generation)|The High Ground]]").
** The past events of "[[Past Tense (Star Trek: Deep Space Nine)|Past Tense]]" (DS9), namely the "Bell Riots".
** The past events of ''[[Star Trek: Picard]]'' Season 2.
* 2026
** [[World War III (Star Trek)|World War III]] begins on [[Earth]]. [[Colonel Phillip Green]] and a group of [[eco-terrorist]]s commit [[genocide]] that claimed the lives of thirty-seven million people. (''ENT'' "[[In A Mirror, Darkly|In A Mirror Darkly, Part Two]]") (In TOS, WWIII took place in the 1990s and is established as an alternate name for the Eugenics Wars<ref name=space_seed /> while DS9's "Doctor Bashir, I Presume?" had the Eugenics Wars in the 22nd century. SNW's "Strange New World" retcons the Eugenics Wars to the 21st century, but prior to the outbreak of WWIII.)
* 2032
** Ares IV, a crewed mission to Mars is launched.<ref>Established in the episode "[[One Small Step (Star Trek: Voyager)|One Small Step]]".</ref>
** [[Zefram Cochrane]] is born.
* 2037
** The spaceship ''Charybdis'' makes an attempt to leave the solar system.<ref>The year is stated in "[[The Royale]]"</ref>
* 2047
** The Hermosa quake strikes the region of southern California surrounding [[Los Angeles]]. The land sinks under two hundred meters of water. In the ensuing centuries, the region recovers, having transformed into one of the world's largest coral reefs. These reefs become home to thousands of different marine species.{{what|What episode/story?|date=May 2022}}
* 2053
** [[World War III (Star Trek)|World War III]] ends and [[Earth]] is left devastated, mostly because of nuclear warfare. Most of the major cities are left in ruins with few remaining governments and the death total reaching 600 million. Scientific advancement continues, however.<ref>The war ends 10 years before ''Star Trek: First Contact'', set in 2063.</ref> (In TOS, WWIII took place in the 1990s and is established as an alternate name for the Eugenics Wars<ref name=space_seed /> while DS9's "Doctor Bashir, I Presume?" had the Eugenics Wars in the 22nd century. SNW's "Strange New World" retcons the Eugenics Wars to the 21st century, but prior to the outbreak of WWIII.)
* 2062
** Oldtown San Francisco is struck by an enormous earthquake, the Greater Quake, and it takes 20 years for the city to be restored.
* 2063
** The past events of ''[[Star Trek: First Contact]]''. [[Zefram Cochrane]] makes the first human warp flight with the ''[[Phoenix (Star Trek)|Phoenix]]'' as civilization rebuilds following WWIII. This attracts the [[Vulcan (Star Trek)|Vulcans]] and they make [[First contact (science fiction)|first contact]] with humans. (TOS "[[Metamorphosis (Star Trek: The Original Series)|Metamorphosis]]" stated that Zefram Cochrane disappeared 150 years ago at the age of 87, which fits with the current timeline.)
** In the Mirror Universe, Cochrane kills the Vulcan captain and his followers loot the Vulcan scout ship, leading to the founding of the Terran Empire. It is unclear whether this is the point of divergence between the Mirror Universe and the Prime Universe. ("[[In a Mirror, Darkly]]" (ENT))
* c. 2065
** The [[SS Valiant|SS ''Valiant'']] is launched.<ref name=okuda /><ref>The ''Chronology'' dates this exactly 200 years before the episode "[[Where No Man Has Gone Before]]".</ref>
* 2067
** The uncrewed interstellar warp probe ''Friendship 1'' is launched.<ref>Established in the episode "[[Friendship One (Star Trek: Voyager)|Friendship One]]".</ref>
* 2069
** The colony ship SS ''Conestoga'' is launched. It would found the Terra Nova colony.<ref>Established the episode "[[Terra Nova (Star Trek: Enterprise)|Terra Nova]]"</ref>
* 2079
** Earth begins to recover from its nuclear war.<ref>"[[Encounter at Farpoint]]" features a Q-induced flashback to this era.</ref> The recovery is aided and partially organized by a newly established political entity called the ''European Hegemony''.<ref name=okuda />
* 2088
** [[T'Pol]] is born.

===22nd century===
* 2103
** Earth colonizes Mars.
* 2112
** [[Jonathan Archer]] is born in upstate New York on Earth.<ref name=mirror_darkly>From a computer screen in "[[In a Mirror, Darkly]]"</ref>
* 2119
** [[Zefram Cochrane]], who now is residing on [[Alpha Centauri]], sets off for parts unknown and disappears. Some had thought he was testing a new engine. After an exhaustive search, it is believed that Cochrane has died. He becomes one of the most famous missing people in history.<ref>About 150 years before "[[Metamorphosis (Star Trek: The Original Series)|Metamorphosis]]" (dated by Okuda as 2267), which is shown by ''[[Star Trek: Enterprise|Enterprise]]'' to be an approximation.</ref>
* 2129
** [[Hoshi Sato]] is born.<ref name=mirror_darkly />
* 2130
** The United Nations establishes Starfleet Command with San Francisco as its headquarters.
* 2142
** Warp 2 barrier broken by Commander Robinson in NX ''Alpha'' and Warp 2.5 achieved by Commander Archer in NX ''Beta''.
* 2145
** Warp 3 broken by Commander Duvall in NX ''Delta''.
* 2149
** Starship ''Enterprise'' (NX-01), the first Warp 5-capable ship built by humans, begins construction in upstate New York.
* 2150
** Keel laid for ''Enterprise'' (NX-01).
* 2151–2155
** '''The events of ''[[Star Trek: Enterprise]]'' take place.'''<ref>{{cite web|url=http://www.startrek.com/custom/include/series/ENT/episode_list_season.html |title=Star Trek: Enterprise: Episodes by Season |access-date=December 31, 2006 |url-status=dead |archive-url=https://web.archive.org/web/20061111162848/http://www.startrek.com/custom/include/series/ENT/episode_list_season.html |archive-date=November 11, 2006 }}</ref>
* 2151
** First contact between humans and [[Klingon]]s. The NX-01 ''Enterprise'', commanded by Captain [[Jonathan Archer]], begins her exploratory mission. ("[[Broken Bow (Star Trek: Enterprise)|Broken Bow]]" (ENT))
* 2153
** As a result of incursions from the [[Temporal Cold War]] of the 27th-31st centuries, a confederation of species called the [[Xindi (Star Trek)|Xindi]] test-fire a planet killer weapon against Earth, causing approximately 1 million casualties ("[[The Expanse (Star Trek: Enterprise episode)|The Expanse]]" (ENT)). The NX-01 ''Enterprise'' defeats the Xindi but is thrown back in time to 1944. ("[[Zero Hour (Star Trek: Enterprise)|Zero Hour]]" (ENT))
* 2154
** Captain Archer rediscovers Surak's lost writings, thwarting the Romulans' infiltration of Vulcan's government. ("[[Kir'Shara]]" (ENT))
** The Klingon species becomes infected by a genetically engineered virus. The cure, using human antibodies, causes the Klingons to lose their cranial ridges and become slightly less aggressive. ("[[Divergence (Star Trek: Enterprise)|Divergence]]" (ENT))
*2155
** The USS ''Defiant'', a Constitution-class vessel from the Prime Universe in 2268, travels back in time and also emerges in the Mirror Universe following its interaction with an anomaly. The abandoned ''Defiant'' is found by the Tholians. The Terran Empire learns of the ship's existence and subsequently captures it for their own use. ("[[In a Mirror, Darkly]]" (ENT))
* 2156–2160
** The [[Earth–Romulan War]] is fought between United Earth and its allies, and the [[Romulan|Romulan Star Empire]]. The war ends with the Battle of Cheron, a humiliating defeat to the Romulans, to such a degree that the Empire still considers the battle an embarrassment over 200 years later. The [[Romulan Neutral Zone]] is established.<ref name=okuda /> Because all communications with Romulans were conducted only by audio, no non-Vulcan species learn that Romulans are an offshoot of Vulcans. ("[[Balance of Terror]]" (TOS))
* 2161
** The [[United Federation of Planets]] is founded by [[Earth]], [[Tellarite|Tellar]], [[Andorian|Andoria]], and [[Vulcan (Star Trek)|Vulcan]].<ref>The ''TNG'' episode ''[[Conundrum (Star Trek: the Next Generation)|Conundrum]]'' refers to this date, based on an early draft of the ''Chronology'', which had proposed 2161. "[[These Are the Voyages...]]" depicts the founding ceremony and officially states the founding members.</ref><ref>Although the season three ''Enterprise'' episode "Zero Hour" indicates the date as 2159</ref>
* 2165
** [[Sarek]], Federation diplomat and father of [[Spock]], is born on Vulcan.<ref>Sarek gives his age as 102.437 in "[[Journey to Babel]]".</ref>
* 2184
** Jonathan Archer is elected as the first United Federation of Planets President.
* 2192
** Jonathan Archer steps down as UFP President after 8 years.
* 2195
** Robert April is born.
* 2160s to 2196
** The ''Daedalus''-class starship is active.<ref>In the episode "[[Power Play (Star Trek: The Next Generation)|Power Play]]", [[Data (Star Trek)|Data]] gives the year 2196 as the retirement date of the ''Daedalus''-class starships, which had been active 200 years before the episode, in the 2160s.</ref>

===23rd century===
* 2222
** [[Montgomery Scott]] is born in [[Scotland]].<ref>The episode "[[Relics (Star Trek: The Next Generation)|Relics]]" establishes that Scotty was born 147 years before 2369.</ref>
* 2226
** [[Michael Burnham]] is born on Earth.<ref>''[[Star Trek: Discovery]]'' S01E04</ref>
* 2227
** [[Leonard McCoy]] is born in Georgia, North America on Earth.<ref>McCoy is 137 years old in "[[Encounter at Farpoint]]", set in 2364.</ref>
* 2230
** [[Spock]], the son of Sarek and the human [[Amanda Grayson]], is born on [[Vulcan (Star Trek planet)|Vulcan]].<ref>The ''Chronology'' dates this based on a line from an early draft script from "[[Journey to Babel]]"</ref>
* 2232
** '''The events of ''[[Star Trek: Short Treks]]'' episode "The Girl Who Made the Stars" take place.'''
* 2233
** [[James T. Kirk]] is born in [[Riverside, Iowa|Riverside]], [[Iowa]] on Earth.<ref>Kirk is said to be 34 in "[[The Deadly Years]], which Okuda dates to 2267.</ref>
* 2233 (alternate timeline): Prologue scene of ''[[Star Trek (2009 film)|Star Trek]]''.
** Ambassador Spock and the Romulan mining ship ''Narada'', commanded by Nero, emerge from a black hole created by Spock's detonation of red matter in 2387 and arrive in the past. Nero's arrival and subsequent attack on the USS ''Kelvin'' create the Kelvin Timeline.
** James T. Kirk is born aboard a shuttlecraft from the USS ''Kelvin''.
** James T. Kirk's father, George Kirk, is killed.
* 2238
** '''The events of ''[[Star Trek: Short Treks]]'' episode "The Brightest Star" take place.'''
* 2241 (alternate timeline)
** [[Pavel Chekov]] born in Russia on Earth.
* 2245–2250
** The [[USS Enterprise (NCC-1701)|USS ''Enterprise'']], a Constitution class vessel, is launched under the command of [[Robert April]], on a five-year mission of exploration.<ref name=okuda /> In the alternate time line created by [[Captain Nero|Nero]]'s attack on the USS ''Kelvin,'' the ''Enterprise'' is still under construction in 2255 and is not launched on its maiden voyage until 2258.
* 2245
** [[Pavel Chekov]] is born to [[Russians|Russian]] parents.<ref>Chekov is 22 in the episode "[[Who Mourns for Adonais?]]".</ref> In the alternate timeline created by [[Captain Nero|Nero]]'s attack on the USS ''Kelvin,'' Chekov is only eight years younger than James T. Kirk, implying a birthdate of 2241.<ref>In ''[[Star Trek (2009 film)|Star Trek]]'' Chekov states that he is 17&nbsp;– Kirk is 25.</ref>
* 2250
** After a refit, the [[USS Enterprise (NCC-1701)|USS ''Enterprise'' (NCC-1701)]] is launched on a second five-year mission. Command of the ship is assigned to Captain [[Christopher Pike (Star Trek)|Christopher Pike]].<ref name=okuda />
* 2254
** '''The events of ''[[Star Trek: Short Treks]]'' episode "Q&A" take place.'''
** '''The events of "[[The Cage (Star Trek: The Original Series)|The Cage]]".'''<ref>Thirteen years before the events of "[[The Menagerie (Star Trek: The Original Series)|The Menagerie]]", according to dialogue.</ref>
* 2256-2257
** '''The events of ''[[Star Trek: Discovery]]'' season 1 take place.''' The Klingon-Federation War.
* 2257
** '''The events of ''[[Star Trek: Section 31]]'' take place.'''
* 2257-2258
** '''The events of ''[[Star Trek: Discovery]]'' season 2 take place.''' The USS ''Discovery'' and [[USS Enterprise (NCC-1701)|USS ''Enterprise'' (NCC-1701)]] engage in a pitched battle to neutralise the rogue AI Control. The battle is a success, but the ''Enterprise'' falsely reports that the ''Discovery'' was lost with all hands, to conceal the fact that it traveled 930 years into the future in order to prevent Control from reasserting itself. The ''Enterprise'' subsequently undergoes repairs and departs for Edrin II 4 months later.
* 2258 (alternate timeline)
** '''The events of ''[[Star Trek (2009 film)|Star Trek]]'' take place.''' [[Captain Nero|Nero]] destroys the planet [[Vulcan (Star Trek)|Vulcan]]&nbsp;– killing billions, including Spock's mother&nbsp;– as well as 9 [[Federation]] starships. The [[USS Enterprise (NCC-1701)|USS ''Enterprise'' (NCC-1701)]] is built in the state of [[Iowa]] and is launched on its maiden voyage under Captain [[Christopher Pike (Star Trek)|Christopher Pike]]. [[James T. Kirk]] becomes the ship's new captain shortly afterward.
** '''The events of ''[[Star Trek: Bridge Crew]]'' take place.''' The USS Aegis is searching for a new homeworld for the Vulcans after the destruction of their planet. The ship heads for a region of space called 'The Trench', which is being occupied by Klingons.
** '''The events of ''[[Star Trek (2013 video game)]]'' take place.''' Captain Kirk, Spock, and the crew of the USS ''Enterprise'' encounter a powerful alien race known as the Gorn.
* 2259 (alternate timeline)
** Some time prior to this point in the Kelvin timeline, the Federation black ops unit Section 31 revives [[Khan Noonien Singh]] from suspended animation on the ''Botany Bay'', forcing him to undergo plastic surgery and work as a Section 31 agent under the identity of "John Harrison".
** '''The events of ''[[Star Trek Into Darkness]]'' take place.''' Khan is returned to suspended animation on Earth as punishment for acts of terrorism.
* 2259
** ''' The events of ''[[Star Trek: Strange New Worlds]]'' season 1 take place.'''
** The ''Enterprise'' begins another five-year mission under Christopher Pike.
* 2260 (alternate timeline)
** ''The Enterprise'' is launched on a historic five-year mission.
* 2263 (alternate timeline)
** Space Station Yorktown is established by Commodore Paris.
** '''The events of ''[[Star Trek Beyond]]'' take place.''' The USS ''Enterprise'' is destroyed; USS ''Enterprise''-A is commissioned at Starbase Yorktown as its replacement.
** Ambassador [[Spock]] from the Prime Universe dies in the Kelvin Universe.
* 2261–2264
** The [[USS Enterprise (NCC-1701)|USS ''Enterprise'' (NCC-1701)]] undergoes a major refit, increasing its crew complement from 203 to 430.<ref name=okuda />
* 2263
** Boothby, groundskeeper and counselor at [[Starfleet Academy]], is born.
* 2265–2270
** Following the promotion of [[Christopher Pike (Star Trek)|Christopher Pike]], Captain [[James T. Kirk]] is assigned command of the ''Enterprise'' on a historic five-year mission.<ref name=okuda /> (In the originally canonical ''[[Star Trek Spaceflight Chronology]]'' this was 2207 to 2212; ''[[Star Trek: Strange New Worlds]]'' contradicts this somewhat by dating Pike's accident to approximately 2268 or 2269 (per dialogue in the episode "Strange New World" stating the accident occurs 10 years in the future), but the TOS episode "The Menagerie" takes place during the first season, approximately a year into Kirk's mission rather than close to its end.)
* 2265
** '''The events of "[[Where No Man Has Gone Before]]" (TOS)'''
* 2266–2269
** '''The events of ''[[Star Trek: The Original Series]]'' take place.'''
* 2266
** When the [[USS Enterprise (NCC-1701)|USS ''Enterprise'' (NCC-1701)]] engages a Romulan Bird-of-Prey in combat, the secret that Romulans are the same species as Vulcans is finally revealed. ("[[Balance of Terror]]" (TOS))
** The ''Enterprise'' crew revive [[Khan Noonien Singh]] and 72 surviving Augments from suspended animation on the ''Botany Bay''. After stopping the Augments from taking control of the ''Enterprise'', Captain Kirk exiles them to the planet Ceti Alpha V. ("[[Space Seed]]" (TOS).) Unbeknownst to Kirk, the explosion of a neighboring planet destroys most of Ceti Alpha V's ecosystem six months later. (''[[Star Trek II: The Wrath of Khan]]'')
* 2267
** Kirk discovers that [[Zefram Cochrane]] was abducted to a distant planetoid by an energy being that granted him immortality. ("[[Metamorphosis (Star Trek: The Original Series)|Metamorphosis]]" (TOS))
* 2268
** USS ''Defiant'' disappears from the Prime Universe, reemerging in the Mirror Universe of 2155. ("[[The Tholian Web]]" (TOS))
* 2269-2270
** '''The events of ''[[Star Trek: The Animated Series]]'' take place.''' (There is no on-screen confirmation of this, but anecdotally TAS is believed to take place towards the end of the mission.)
** During some period between 2269 and 2273, the Klingons regain their cranial ridges.
* 2270
** USS ''Enterprise'' returns from its five-year mission under the command of Captain [[James T. Kirk]] and enters major refit while Kirk is promoted to Admiral at [[Starfleet|Starfleet Command]]. Captain Will Decker is assigned command of the vessel.
* 2273
** '''The events of ''[[Star Trek: The Motion Picture]]''.'''
*** ''Voyager 6'' returns to Earth, having been massively enhanced by alien technology to become an entity calling itself "[[V'ger]]".
*** Kirk takes over command of the ''Enterprise'' from Decker, who subsequently merges with V'ger and ascends to a higher plane of existence.
* 2273-2278
** The upgraded [[USS Enterprise (NCC-1701)|USS ''Enterprise'' (NCC-1701)]] embarks on a five-year mission under the command of Admiral [[James T. Kirk]].<ref name=okuda />
* 2278
** The USS ''Bozeman'', under the command of Captain Morgan Bateson, enters a temporal causality loop in which it will remain for 90 years until it encounters the [[USS Enterprise (NCC-1701-D)|USS ''Enterprise'' (NCC-1701-D)]] stuck in the same loop. ("[[Cause and Effect (Star Trek: The Next Generation)|Cause and Effect]]" (TNG))
* 2279
** Around this time the [[USS Enterprise (NCC-1701)|USS ''Enterprise'' (NCC-1701)]] is retired from active duty and assigned as a training vessel in orbit of [[Earth]].<ref name=okuda /> At some point during this period, Spock is promoted to captain and assigned command of the vessel.
* 2284
** The USS ''Excelsior'' (NX-2000), the first ship equipped with transwarp drive, is built in San Francisco Fleet Yards and was later docked at Earth Spacedock. Unfortunately, the ship was still unfinished due to many specifications and was completed in upstate New York before its commissioning as USS ''Excelsior'' (NCC-2000).
* 2285
** '''The events of ''[[Star Trek II: The Wrath of Khan]]''.'''
*** [[Khan Noonien Singh]] and his remaining Augments escape from Ceti Alpha V and steal USS ''Reliant'' and the Genesis Device. All of them are killed in combat against the ''Enterprise''.
*** Kirk takes over command of the ''Enterprise'' from Captain Spock, who subsequently dies.
** '''The events of ''[[Star Trek III: The Search for Spock]]''.''' The original [[USS Enterprise (NCC-1701)|USS ''Enterprise'' (NCC-1701)]], having been decommissioned by Starfleet, is destroyed to prevent it from falling into Klingon hands. Spock is revived.
* 2286
** '''The events of ''[[Star Trek IV: The Voyage Home]]''.''' 
** The [[USS Enterprise (NCC-1701-A)|USS ''Enterprise'' (NCC-1701-A)]] is launched on its maiden voyage under the command of the newly demoted Capt. James Kirk.
* 2287
** '''The events of ''[[Star Trek V: The Final Frontier]]''.'''
* 2293
** '''The events of ''[[Star Trek VI: The Undiscovered Country]]''.''' The [[USS Enterprise (NCC-1701-A)|USS ''Enterprise'' (NCC-1701-A)]] is decommissioned shortly afterwards.
** The opening events of ''[[Star Trek Generations]]''. The [[USS Enterprise (NCC-1701-B)|USS ''Enterprise'' (NCC-1701-B)]] is launched under the command of John Harriman. While responding to a distress call, the ''Enterprise'' is struck by a discharge from the Nexus which breaches the hull and James T. Kirk is presumed killed in the blast. (The exact timing is uncertain and the events of ''Generations'' could take place in a later year.)

===24th century===
* 2305
** [[Jean-Luc Picard]] is born in [[La Barre, Haute-Saône|La Barre]], France on Earth.<ref name=conundrum>A biography shown in "[[Conundrum (Star Trek: the Next Generation)|Conundrum]]" establishes the birth-year and birth-place.</ref>
* 2311
** The [[Tomed Incident]].<ref name=okuda /><ref>This incident, the last contact between the Romulans and the Federation is said to be 53 years before "[[List of Star Trek regions of space|The Neutral Zone]]"</ref>
* 2319
** [[Gary Seven]] is born.
* 2320
** [[Bolians]] join the Federation.
* 2324
** [[Beverly Crusher|Beverly Howard (Crusher)]] is born in Copernicus City, [[Moon|Luna]].<ref name="conundrum" />
* 2327
** [[Jean-Luc Picard]] graduates from Starfleet Academy on Earth (2323-2327). {{Citation needed|date=August 2019}}
* 2329
** [[Chakotay]] is born on a Federation colony near Cardassian space in the demilitarized zone
* 2332
** [[Benjamin Sisko|Benjamin L. Sisko]] is born in [[New Orleans]], [[Louisiana]] on Earth.<ref name=okuda />
* 2333
** Jean-Luc Picard becomes captain of the USS ''Stargazer''.<ref name=okuda />
* 2335
** [[Geordi La Forge]] is born in Mogadishu, Somalia on Earth.<ref name=conundrum />
** [[William T. Riker]] is born in [[Valdez, Alaska|Valdez]], [[Alaska]] on Earth.<ref name=okuda />
* 2336
** [[Deanna Troi]] is born on Betazed.<ref name=conundrum />
** [[Kathryn Janeway]] is born in [[Bloomington, Indiana|Bloomington]], [[Indiana]] on Earth.<ref>{{cite web|title='Star Trek' Monument Unveiling Rescheduled For October|url=https://indianapublicmedia.org/news/star-trek-monument-unveiling-rescheduled-for-october.php|last=Knobeloch|first=Payton|website=News - Indiana Public Media|access-date=2020-05-22}}</ref>
* 2337
** [[Tasha Yar]] is born in a failed Federation colony on Turkana IV.<ref name=okuda />
* 2340
** [[Worf]], son of Mogh, is born on the Klingon homeworld, Qo'noS.<ref name=okuda /><ref>The ''Chronology'' derives this figure from working backwards from the Khitomer massacre of 2346.</ref>
* 2341
** [[Julian Bashir]] is born.<ref>Bashir celebrates his 30th birthday in "[[Distant Voices (Star Trek: Deep Space Nine)|Distant Voices]]"</ref>
* 2343
** The ''Galaxy'' class development project is officially given the greenlight by [[Starfleet|Starfleet Command]].<ref name=tng_tm />
* 2344
** The [[USS Enterprise (NCC-1701-C)|USS ''Enterprise'' (NCC-1701-C)]], under the command of Captain Rachel Garrett, is destroyed defending a [[Klingon]] settlement on [[Yesterday's Enterprise|Narendra III]] under attack from [[Romulan]]s.<ref name=okuda /><ref>This is said to occur twenty-two years before "Yesterday's Enterprise" (2366)</ref>
** Due to the ''Enterprise-C''{{'}}s sacrifice, a new era of more open communication begins between the Federation and the Klingon Empire, leading to a formalized alliance.
** In the alternate timeline where ''Enterprise-C'' is not destroyed, the Klingons fight a long, destructive war against the Federation.
* 2345
** Sela (half-Romulan/half-Human), daughter of Natasha Yar (alternate reality from "Yesterday's Enterprise"), is born.
* 2346
** [[Worf]]'s parents are killed by Romulans in the [[Khitomer]] massacre. Worf (age 6) is adopted by human parents.<ref name=okuda /><ref>The ''Chronology'' derives this figure by subtracting 20 years from 2366 ("[[Sins of the Father (Star Trek: The Next Generation)|Sins of the Father]]"). The ''Chronology'' notes an inconsistency, as the episode "[[Birthright (Star Trek: The Next Generation)|Birthright]]", which it sets in 2369, gives a figure of 2344.</ref>
* 2349
** [[Seven of Nine|Annika Hansen]] is born in Tendara Colony to Magnus and Erin Hansen.
* 2355
** Magnus, Erin, and Annika Hansen are assimilated by the Borg while on a research mission in the Delta quadrant.
** The USS ''Stargazer'' is attacked by an unknown vessel (later discovered to be [[Ferengi]] in origin) in the Maxia Zeta system. [[Jean-Luc Picard]] wins the confrontation by devising a tactic which becomes known as the ''Picard Manoeuvre''. However, due to damage suffered during the battle, the crew are forced to abandon ship. The ''Stargazer'' is later recovered in 2364.
* 2357
** [[Worf]] is the first [[Klingon]] to enter [[Starfleet Academy]].<ref name=okuda />
** USS ''Galaxy'' (NX-70637), the prototype ''Galaxy'' class is launched.<ref name=tng_tm />
* 2363
** [[USS Enterprise (NCC-1701-D)|USS ''Enterprise'' (NCC-1701-D)]], the third ''Galaxy''-class starship (following the ''Galaxy'' and ''Yamato'') is launched from the Utopia Planitia shipyards in Mars orbit (under the command of Jean-Luc Picard), and becomes the [[United Federation of Planets|Federation's]] new [[flagship]].
* 2364–2370
** '''The events of ''[[Star Trek: The Next Generation]]'''''.
* 2364
** First contact with the [[Q (Star Trek)|Q Continuum]]. ("[[Encounter at Farpoint]]" (TNG))
* 2365
** Q forces the ''Enterprise''-D to make first contact with the [[Borg]]. ("[[Q Who]]" (TNG))
* 2367
** The Borg assimilate Captain [[Jean-Luc Picard]] and fight the [[Battle of Wolf 359]] against a Starfleet task force 7.7 light years from Earth. The battle results in the loss of 39 Starfleet vessels and over 11,000 lives ("[[The Best of Both Worlds (Star Trek: The Next Generation)|The Best of Both Worlds]]" (TNG)). [[Benjamin Sisko]] aboard the USS ''Saratoga'' is a participant in the battle and is one of the few survivors alongside his son [[Jake Sisko]] ("[[Emissary (Star Trek: Deep Space Nine)|Emissary]]" (DS9)). With the task force lost, the Borg continue to Earth. Picard is rescued and the Borg cube is destroyed via the actions of the crew of the [[USS Enterprise (NCC-1701-D)|''Enterprise''-D.]]
* 2368
** Ambassador [[Spock]] lives undercover on Romulus, supporting an underground movement to reunify [[Romulan]]s with [[Vulcan (Star Trek)|Vulcan]]s. ("[[Unification (Star Trek: The Next Generation)|Unification]]" (TNG))
* 2369–2375
** '''The events of ''[[Star Trek: Deep Space Nine]]''.'''
* 2369
** Terok Nor, a [[Cardassian]] space station orbiting Bajor, is taken over by Starfleet following the end of hostilities between Bajor and Cardassia. It is redesignated [[Deep Space Nine (fictional space station)|Deep Space Nine]] and placed under the command of Commander (later Captain) Benjamin Sisko. Soon after, the discovery of a stable wormhole between the Alpha and Gamma quadrants leads to DS9 being relocated near the wormhole's location in order to facilitate trade, exploration and defense.
* 2370
** '''The events of ''[[Star Trek: Enterprise]]'' episode "These Are the Voyages..." take place.''' (this is due to the story being depicted as a holodeck recreation concurrent with the events of the TNG episode ''The Pegasus'').
** The {{USS|Defiant|NX-74205}}, a mothballed prototype originally designed to fight the Borg, is commissioned into active service and is assigned to [[Benjamin Sisko]] to help protect DS9. Due to the ''Defiant'' being over-powered and over-gunned for its size, several flaws in the ship's design require attention before it reaches a fully operational status. The ''Defiant'' is officially classed as an escort vessel; however, unofficially it is considered a warship built purely for combat.
* 2371
** '''The "present-day" events of ''[[Star Trek Generations]]''.''' The [[USS Enterprise (NCC-1701-D)|USS ''Enterprise'' (NCC-1701-D)]]'s stardrive section is destroyed by a warp core breach; the saucer section containing the crew makes a forced landing on Veridian III. The ship is subsequently declared a total loss. James T. Kirk reappears from the temporal continuum in which he had been since his disappearance in 2293. Kirk is killed on Veridian III.
* 2371–2378
** '''The events of ''[[Star Trek: Voyager]]'''''.
** "[[Caretaker (Star Trek: Voyager)|Caretaker]]": the [[USS Voyager (Star Trek)|USS ''Voyager'']], under the command of Capt. Kathryn Janeway is stranded deep in the [[Delta Quadrant]] and faces a 75-year-long voyage back to Federation space. Janeway merges her crew with survivors of a vessel staffed by members of an organization called the Maquis that at this time are de facto enemies of the Federation.
* 2372
** ''Sovereign''-class [[USS Enterprise (NCC-1701-E)|USS ''Enterprise'' (NCC-1701-E)]] is launched under the command of Captain [[Jean-Luc Picard]] (with most of his command crew from the 1701-D intact).
* 2373
** '''The events of ''[[Star Trek: First Contact]]''.''' The Battle of Sector 001 occurs with a Starfleet task force engaging in a running battle with a Borg cube en route to Earth. The [[USS Defiant (NX-74205)]] from DS9 is severely damaged but not destroyed, with the crew evacuating to the Enterprise. The [[USS Enterprise (NCC-1701-E)|USS ''Enterprise'' (NCC-1701-E)]] follows a Borg sphere through a temporal rift and events shift at that point to 2063.
** Still unaware that the [[USS Voyager (Star Trek)|USS ''Voyager'']] is stuck in the Delta Quadrant, Starfleet officially declares the ship lost with all hands.
* 2373–2375
** Tensions between the Alpha and Gamma quadrants erupt into open warfare, igniting the [[Dominion War]] fully, with DS9 at its epicenter.
* 2374
** Annika Hansen (who now identifies herself by the Borg designation [[Seven of Nine]]) is liberated from the Borg collective by the [[USS Voyager (Star Trek)|USS ''Voyager'']] crew. ([[Scorpion (Star Trek: Voyager)|"Scorpion, Part II"]] (VOY))
** Using an abandoned sensor array network, the [[USS Voyager (Star Trek)|USS ''Voyager'']] detects a Federation vessel, the USS ''Prometheus'', on the edge of the Alpha Quadrant and transmits [[The Doctor (Star Trek: Voyager)|The Doctor]] to the ship. After freeing the ship from the Romulans with help from the ''Prometheus'' EMH, ''Voyager'' officially re-establishes contact with Starfleet.
* 2375
** The [[USS Defiant (NX-74205)]] is destroyed. Several weeks later, DS9 receives a replacement Defiant Class vessel, the ''USS São Paulo''. Captain Sisko is granted special permission by Starfleet to rename the vessel ''Defiant''.
** After devastating losses on both sides, the Federation, alongside the Romulan and Klingon Empire, make a final push against the Dominion, resulting in the Battle of Cardassia. The Dominion subsequently surrenders to the Federation.
** '''The events of ''[[Star Trek: Insurrection]]''.'''<ref>{{cite web|url=http://www.startrek.com/startrek/view/series/MOV/009/character/1119649.html|title=Biography: Anij|publisher=startrek.com|access-date=2006-12-05|archive-date=2010-03-23|archive-url=https://web.archive.org/web/20100323054019/http://www.startrek.com/startrek/view/series/MOV/009/character/1119649.html|url-status=dead}}</ref> Dialogue in this film and in the DS9 finale "[[What You Leave Behind]]" place the chronology of this film as during that episode, after the final battle of the war but before the treaty signing ceremony. Most notable in the film is Worf's ability to leave the station to join the ''Enterprise,'' as well as a line about Federation diplomats being involved in Dominion negotiations, and the Federation's willingness to work with the Son'a, who are established as a Dominion ally during the war.
* 2378
** With the help of Admiral Janeway from an alternate timeline in which the ship's return is delayed many years with tragic results, the USS ''Voyager'' returns to the [[Alpha Quadrant]]. ("[[Endgame (Star Trek: Voyager)|Endgame]]"). Tom Paris' and B'Elanna Torres's daughter is born. At some point after returning home (and prior to the events of ''[[Star Trek: Nemesis]]''), Janeway is promoted to Vice Admiral in the main timeline.
* 2379
** '''The events of ''[[Star Trek: Nemesis]]'',''' resulting in the death of Lieutenant Commander Data.<ref>{{cite web|url=http://www.startrek.com/startrek/view/series/TNG/character/1112457.html|title=Biography: Data|publisher=startrek.com|access-date=2006-12-05|archive-date=2010-07-10|archive-url=https://web.archive.org/web/20100710232332/http://www.startrek.com/startrek/view/series/TNG/character/1112457.html|url-status=dead}}</ref>
** Discovery of previously unknown android named "B-4", a prototype android similar in design to Lt. Commander Data but with a notably less advanced positronic network.
* 2380-2381
** '''The events of ''[[Star Trek: Lower Decks]]''.''' <ref>{{Cite tweet |ref= |last=Winters |first=Brad |user=BradinLA |number=1575316473458794497 |date=28 September 2022 |title=Actually… this will be the first episode to take place in 2381. All of seasons 1, 2, and 1st half of 3 are in 2380. Theres a fancy formula that I don't understand but @drerinmac does, and that's what matters. |access-date=30 September 2022}}</ref>
* 2383
** '''The events of ''[[Star Trek: Prodigy]]'''''.
* 2385, First Contact Day
** '''The events of ''[[Star Trek: Short Treks]]'' episode "Children of Mars" take place.''' The Utopia Planitia Fleetyards on Mars are sabotaged and subsequently destroyed by rogue synthetics in a surprise attack. The battle results in the loss of 92,143 lives, the planet itself being considered destroyed, its [[stratosphere]] ignited, and the destruction of the rescue armada to evacuate Romulus. In the aftermath of the attack, the Federation, unable to determine how or why the synths went rogue, bans the creation of [[Synthetic biology|synthetic liveforms]]
* 2386
** Lieutenant [[Icheb]] is captured and stripped for his [[Borg]] parts by Bjayzl, and subsequently euthanized by [[Seven of Nine]].
* 2387
** A star in the [[Romulan|Romulan Empire]] goes supernova. Ambassador [[Spock]] attempts to counter the resulting shockwave using Red Matter, but is unable to save the planet Romulus from destruction. Spock and the Romulan mining ship ''Narada'', commanded by Nero, are dragged into a [[black hole]] created by the Red Matter detonation and arrive in the past. Nero's arrival in 2233 and subsequent attack on the USS ''Kelvin'' creates the Kelvin Timeline. (''[[Star Trek (2009 film)|Star Trek]]'' (2009))
* 2394 (alternate timeline)
** Voyager returns to the [[Alpha Quadrant]] in the beginning of ''[[Star Trek: Voyager]]'' series finale ("[[Endgame (Star Trek: Voyager)|Endgame]]"). This sets in motion events in which [[Kathryn Janeway]] becomes dissatisfied and begins laying plans to eventually change the timeline and send Voyager home sooner.
* 2395 (alternate timeline)
** The "future" in the ''[[Star Trek: The Next Generation]]'' series finale "[[All Good Things... (Star Trek: The Next Generation)|All Good Things...]]".
* 2399
** '''The events of [[Picard (TV series)|''Star Trek: Picard'']] season 1.'''<ref>[https://trekmovie.com/2018/09/10/year-for-setting-of-star-trek-picard-show-established-storyline-teased-by-ep/ Year For Setting Of Star Trek Picard Show Established, Storyline Teased By EP ]</ref>

=== 25th century ===
* 2401-2402
** '''The events of ''[[Star Trek: Picard]]'' seasons 2-3'''.
* 2402
** USS ''Titan'' (NCC-80102-A) is renamed USS ''Enterprise'' (NCC-1701-G) under the command of Captain [[Seven of Nine]].
* 2404 (alternate timeline)
** The original timeline split in the ''[[Star Trek: Voyager]]'' series finale ("[[Endgame (Star Trek: Voyager)|Endgame]]"), where Admiral Janeway goes back 26 years to the [[Delta Quadrant]] and secures ''Voyager''{{'}}s earlier return to the [[Alpha Quadrant]]. This begins a new timeline (as yet unnamed).

===26th century===
* c. 2540–2550 (alternate timeline)
** The Starship ''Enterprise''-J (presumably NCC 1701-J) is commissioned and takes part in the Battle of Procyon V against the Sphere Builders as shown in ''[[Star Trek: Enterprise|Enterprise]]'' episode "Azati Prime". As the events of the episode “Zero Hour” result in the destruction of the spheres and the dissipation of the altered space, it is likely this battle occurs only in an alternate timeline.

===27th century===
* [[Temporal Cold War]] (with agents from the 31st century); first established in the pilot episode of ''Star Trek: Enterprise'' and recurring until the series' fourth season premiere, it is a struggle between those who would alter history to suit their own ends and those who would preserve the integrity of the original timeline.
* With the distance between them having expanded over the centuries and making travel increasingly difficult, the last crossing between the Prime and Mirror Universes occurs at some point during this century.

===29th century===
* The Aeon-type timeship is in active service during this century ("[[Future's End]]"), as is the ''Wells''-class timeship ''Relativity'' ("[[Relativity (Star Trek: Voyager)|Relativity]]").

===30th century===
* Around the year 2958, supplies of Dilithium in the Milky Way started to dry up, marking the beginning of an energy crisis. The [[United Federation of Planets]] began development and trials of alternatives to warp drive, though none proved to be reliable.
* The Federation spends much of this century engaged in a temporal war with the objective of upholding the Temporal Accords to ensure the timeline remains unaltered.

===31st century===
* 3069
** A cataclysmic galaxy-wide event referred to as "The Burn" occurs. Nearly all Dilithium in the galaxy suddenly goes inert, causing a massive loss of life and the destruction of every ship and facility with an active warp core. In the aftermath, the remaining Dilithium became an ever more scarce resource. With few ships and warp travel severely impeded, no explanation for what happened and the uncertainty if it will happen again, the [[United Federation of Planets]], [[Starfleet#Starfleet Command|Starfleet Command]], and the United Earth, effectively collapse.
* 3074
** '''The main plot of the ''[[Star Trek: Voyager]]'' episode "[[Living Witness]]" takes place, and the final scene takes place "many years" after that.'''
* 3089
** The Federation, Starfleet Command and United Earth leave planet Earth for a new headquarters location. Around the same time, the United Earth government withdraws Earth from the Federation, becoming fully self-sufficient and isolating multiple planets from the rest of the galaxy.
* Episodes with time traveler Daniels from ''[[Star Trek: Enterprise|Enterprise]]'': "[[Cold Front (Star Trek: Enterprise)|Cold Front]]", "[[Shockwave (Star Trek: Enterprise)|Shockwave]]", "[[Azati Prime]]"

=== 32nd and 33rd centuries ===
* 3186
** This is the year Gabrielle Burnham arrived in after using the Red Angel suit to escape a Klingon attack on her home. (Discovery S2 E10)
* 3188-3191, ca. 3225
** '''The events of ''[[Star Trek: Discovery]]'' seasons 3 to 5.'''

=== 34th century ===
* 3374 (alternate timeline)
** According to Obrist, if the Krenim weapon ship continued to alter time to this point, full restoration of the Krenim Imperium would not have been achieved.

===Far future===
* The events of the ''[[Star Trek: Short Treks]]'' episode "Calypso" take place in the 43rd century or later.

*60-70 trillion years
** The Universe will collapse.

==History of the chronology (historiography)==
Several efforts have been made to develop a chronology<ref>{{cite web |url=http://thestartrekchronologyproject.blogspot.com/2009/09/and-now-we-present-complete-star-trek_19.html|title=And now we present the complete Star Trek Canon in chronological order! ENJOY!!!|date=2009-09-19|website=The Star Trek Chronology Project}}</ref> for the events depicted by the ''[[Star Trek]]'' television series and its spin-offs. This matter has been complicated by the continued additions to the ''Star Trek'' canon, the existence of time travel and multiple concurrent timelines, and the scarcity of [[Gregorian calendar]] dates given in the show ([[stardate]]s instead being used).

===Original series===
Not many references set the original series in an exact time frame, and those that exist are largely contradictory. In the episode "[[Tomorrow Is Yesterday]]", a 1960s military officer says that he's going to lock [[James T. Kirk|Captain Kirk]] up "for two hundred years", to which Kirk replies, with wry amusement: "That ought to be just about right." Likewise, in the episode "[[Space Seed]]", it is said that the 1996 warlord [[Khan Noonien Singh]] is from "two centuries" ago. Both these references place the show in the 22nd century. However, in the episode "[[Miri (Star Trek: The Original Series)|Miri]]", it is said that 1960 was around 300 years ago, pushing the show into the 23rd century. Finally, the episode "[[The Squire of Gothos]]" implied that the [[light cone]] of 19th century Earth has expanded to 900 light years of radius, which seems to set the show in the 28th century, since light would take nine centuries to traverse that distance.

According to notes in ''The Making of Star Trek'', the show is set in the 23rd century, and the ''Enterprise'' was supposed to be around 40 years old. Roddenberry says in this book that the stardate system was invented to avoid pinning down the show precisely in time frame.<ref name=making>{{cite book|title=The Making of Star Trek|year=1968|publisher=Ballatine Books|author1=Whitfield, Stephen E  |author2=Roddenberry, Gene |name-list-style=amp }}</ref> Roddenberry's original pitch for the series dated it "'somewhere in the future. It could be 1995, or maybe even 2995".<ref>{{cite book|title=The Star Trek Compendium|publisher=Titan Books|last=Asherman|first=Allan|year=1987|isbn=0-907610-99-4}}</ref>

===Early chronologies===
The ''[[Star Trek Spaceflight Chronology]]'' and [[FASA]], a publisher of the first licensed [[Star Trek: The Role Playing Game|''Star Trek'' role-playing game]], chose to take the "Space Seed figure", adding a few years to make sure the events of the Original Series were in the 23rd century. This dating system is followed by other spin-off works in the 1980s, including ''[[Mr. Scott's Guide to the Enterprise]]''. This timeline system gives the following dates<ref name=spaceflight_chronology>{{cite book|title=Star Trek Spaceflight Chronology|year=1980|last=Goldstein|first=Stanley and Fred|publisher=Pocket Books |isbn=0-671-79089-7}}</ref><ref name=mr_scott>{{cite book|title=Mr Scott's Guide to the Enterprise|year=1987|last=Johnson|first=Shane|isbn=1-85286-028-6|publisher=Titan Books}}</ref>
* The sub-warp ship the UNSS ''Icarus'' makes first contact with Alpha Centauri in 2048, and there meets [[Zefram Cochrane|Zefrem Cochran]] [sic], who has invented warp drive.<ref name=spaceflight_chronology />
* The first Earth warp ship, the ''Bonaventure'' makes its first voyage, to [[Tau Ceti]], in 2059.<ref name=spaceflight_chronology />
* The first contact with [[Vulcan (Star Trek)|Vulcan]]s is in 2065, when a damaged Vulcan spaceship is rescued by UNSS Amity.<ref name=spaceflight_chronology />
* The [[United Federation of Planets|Federation]] is formed in 2087.<ref name=spaceflight_chronology />
* The Earth–Romulan War occurs in the 2100s.<ref name=spaceflight_chronology />
* First contact with the [[Klingon Empire]] in 2151, who demand the return of a group of refugees from the USS Sentry.<ref name=spaceflight_chronology />
* The first ''Constitution''-class starship is launched in 2188.<ref name=spaceflight_chronology />
* The [[USS Enterprise (NCC-1701)|USS ''Enterprise'']]'s [[Star Trek: The Original Series|five-year mission]] under [[James T. Kirk|Captain Kirk]] lasts from 2207 to 2212.<ref name=mr_scott /> <!-- page 12 --->
* The events of ''[[Star Trek: The Motion Picture]]'' occur in 2217.<ref name=mr_scott /> <!-- page 112 says the "Enterprise Class" i.e. the refit Enterprise was launched initially in 2217 -->
* The events of ''[[Star Trek II: The Wrath of Khan]]'' occur around 2222 (dialogue in the film says it is set "fifteen years" after the Season One episode "Space Seed").
* The events of ''[[Star Trek IV: The Voyage Home]]'' occur on September 21, 2222.<ref name=mr_scott /> <!-- page 114 --->

The ''[[Star Fleet Battles]]'' game was published in 1979, with a license only covering the original series. It has since diverged into an entirely separate fictional universe, new additions to which continue to be published. It does not tie into the Gregorian calendar, instead using a "Year 1" of the invention of Warp on Earth. Its version of the original series backstory is:
* Y1&nbsp;– Warp drive is developed on Earth.
* Y4&nbsp;– Federation is formed by Earth, Vulcan, Andoria, Alpha Centauri.
* Y40-Y46&nbsp;– Earth–Romulan War.
* Y71&nbsp;– Starfleet is formed.
* Y126&nbsp;– The Constitution-class is launched (an upgrade from the ''Republic''-class).
* Y154–159&nbsp;– The events of the Original Series.

See [[Star Fleet Universe timeline]].

===TNG era and Okuda===
Press materials for ''The Next Generation'' suggested it was set in the 24th century, seventy-eight years after the existing ''Star Trek'', although the exact time frame had not yet been set in stone. The pilot had dialogue stating Data was part of the Starfleet "class of '78".<ref name=companion>{{cite book|title=Star Trek: The Next Generation Companion|publisher=Pocket Books|year=2003|author=Nemeck, Larry|isbn=0-7434-5798-6}}</ref> The pilot episode, "[[Encounter at Farpoint]]", also has a cameo appearance by [[Leonard McCoy|Leonard "Bones" McCoy]], who is said to be 137.

In the last episode of the first season, the year is firmly established by [[Data (Star Trek)|Data]] as 2364.<ref name=companion /> This marked the first time an explicit future calendar date had been attached to a ''Star Trek'' storyline, and allowed fans and writers to extrapolate further dates. For example, the established date implies McCoy was born around 2227, ruling out the ''Spaceflight Chronology''-derived dating of the original series to the early 23rd century (though the dating had already been effectively overruled by ''Star Trek IV'', which primarily takes place in 1986, where Kirk tells Gillian Taylor that he is from the late 23rd century, though he does not give an exact date).

A ''[[Star Trek Chronology]]'' was published in 1993, written by production staff members [[Denise Okuda]] and [[Michael Okuda]].<ref name=okuda_1ed>{{cite book|last=Okuda|first=Mike|author-link=Michael Okuda|author2=Okuda, Denise|title=Star Trek Chronology: The History of the Future|isbn=0-671-79611-9|publisher=Pocket Books|year=1993|url-access=registration|url=https://archive.org/details/startrekchronolo00okud}}</ref> A second edition was issued in 1996.<ref name=okuda>{{cite book|last=Okuda|first=Mike|author-link=Michael Okuda|author2=Okuda, Denise |title=Star Trek Chronology: The History of the Future|isbn=0-671-53610-9|publisher=Pocket Books|year=1996}}</ref> Okuda originally drew up a timeline for internal use by writers, based on his own research and assumptions provided by [[Richard H. Arnold|Richard Arnold]]. The dates in the ''Chronology'' are consistent with the earlier ''[[Star Trek: The Next Generation Technical Manual]]''.<ref name=tng_tm>{{cite book|first1=Michael|last1=Okuda|author-link=Michael Okuda|author-link2=Rick Sternbach|last2=Sternbach|first2=Rick|year=1991|title=Star Trek: The Next Generation Technical Manual|title-link=Star Trek: The Next Generation Technical Manual |publisher=Pocket Books|isbn=0-671-70427-3}}</ref>

It gives the following dates:
* Zephram Cochrane invents warp drive around 2061 (so that the SS ''Valiant'' can be constructed and go missing two hundred years before "[[Where No Man Has Gone Before]]", dated to 2265; the first edition gives 2061; the second edition moves this to 2063 per ''[[Star Trek: First Contact]]'').
* The Romulan War takes place in the 2150s (about a hundred years before "[[Balance of Terror]]").
* The Federation is formed in 2161, after the Romulan War, on the basis that "Balance of Terror" says that it was an Earth-Romulan war, not a Federation-Romulan War.
* The first Constitution-class starship is launched in 2244, followed by the ''Enterprise'' in 2245.
* Kirk's [[Star Trek: The Original Series|five-year mission]] lasts from 2264 to 2269, based on the assumption that the original series is set exactly 300 years after its original broadcast.
** Aired live-action ''Star Trek'' episodes are dated from 2266 to 2269. The chronology does not include the events of ''[[Star Trek: The Animated Series]]''. This is in keeping also with Gene Roddenberry's concept (discussed in ''The Making of Star Trek'' by Roddenberry and Stephen Whitfield) that ''Star Trek's'' first season takes place after the mission has been under way for some time.
** An episode of ''[[Star Trek: Voyager|Voyager]]'', "[[Q2 (Star Trek: Voyager)|Q2]]", aired after the ''Chronology'' was published, established that Kirk's five-year mission actually ended in 2270.
* The events of ''[[Star Trek: The Motion Picture]]'' take place in 2271 (Kirk has been Chief of Starfleet Operations for {{frac|2|1|2}} years, according to dialog from Kirk and Decker).
** The "[[Q2 (Star Trek: Voyager)|Q2]]" dating for Kirk's five-year mission, moves the first film to c. 2273.
* Numerous sources, including the ''Chronology'', postulate a second five-year mission under now-Admiral Kirk's command, begun soon after the events of the first movie; in part this is to take into account the unproduced revival series [[Star Trek: Phase II]].
* The events of ''[[Star Trek II: The Wrath of Khan]]'' and ''[[Star Trek III: The Search for Spock]]'' take place in 2285.
** ''The Wrath of Khan'' is a sequel to the episode "Space Seed", which Okuda dates to 2267. In Okuda's timeline there is a gap of eighteen years rather than the fifteen years established in dialog. The film was released in 1982, fifteen years after the episode's broadcast in 1967. The film begins on Kirk's birthday, which is semi-canonically established as March 22, the same as [[William Shatner]]'s.
* The events of ''[[Star Trek IV: The Voyage Home]]'' take place in 2286.
** This places ''Star Trek III'' in late 2285, as Kirk states in his log that the ''Enterprise'' crew has been on Vulcan for "three months" since bringing Spock home.
* The events of ''[[Star Trek V: The Final Frontier]]'' apparently take place soon after the events of the fourth film, as evidenced by Scotty's complaints about repairing the ship after its shakedown cruise, which was depicted at the end of ''Star Trek IV''. ''Star Trek V'' would then take place in early 2287.
* The events of ''[[Star Trek VI: The Undiscovered Country]]'' take place in 2293, based on McCoy's statement that he had served on the ''Enterprise'' for 27 years, and his absence in "[[Where No Man Has Gone Before]]".
* The Kirk-era part of ''[[Star Trek Generations]]'' is set 78 years before 2371 (established by way of an on-screen caption), thus is set in 2293 and soon after ''Star Trek VI''.

The gap between the 1986 film ''Star Trek IV: the Voyage Home'' (2286) and the 1987 first season of ''The Next Generation'' (2364) is 78 years by this timeline, matching early press materials.

A gap of 10 years passed between the broadcast of the last episode of ''Star Trek: The Original Series'' and the release of ''The Motion Picture''. The film skirted around the fact the actors had aged, supposing that only {{frac|2|1|2}} years had passed since the events of the TV show. For ''Star Trek II'', it was decided to acknowledge the reality of the aging actors, both by setting the film some 15 years after "Space Seed", and by having Kirk worry about getting old.<ref>{{cite book|title=From Sawdust to Stardust|author=Terry Lee Rioux|isbn=978-0-7434-5762-0|publisher=Pocket Books|year=2005}}</ref>

Within ''The Next Generation'' era, episodes and films are easier to date. Stardates correspond exactly with seasons, with the first two digits of the stardate representing the season number. Okuda assumes the start of a season is January 1 and the end of the season is December 31.<ref name=okuda /> ''The Next Generation'', ''Deep Space Nine'', and ''Voyager'' television series, as well as the movies, have roughly followed "real time", and are set around 377 years after their release.

Since the ''Chronology'' was published, it has been generally adhered-to by the producers of the show. The film ''[[Star Trek: First Contact]]'' and prequel series ''[[Star Trek: Enterprise]]'' both revisit the early era. In ''First Contact'', Zephram Cochrane is confirmed as having invented warp drive on Earth, but the date is moved forward slightly to 2063, and it is revealed that Earth's official first contact with an alien species, the Vulcans, took place immediately afterwards as a result of this.

The dating of the final season of ''[[Star Trek: Voyager]]'' has presented controversy. The standard assumption about stardates, as well as the regular correspondence between seasons and in-universe years, would place the entire season in the year 2377; the season begins with stardate 54014.4 and ends with 54973.4. However, the episode "[[Homestead (Star Trek: Voyager)|Homestead]]" features a celebration of the 315th anniversary of [[Zefram Cochrane]]'s first contact with the [[Vulcan (Star Trek)|Vulcans]], which would set the episode on April 5, 2378. The fansite [[Memory Alpha]] thus places the final eight episodes of the season ("[[Human Error (Star Trek: Voyager)|Human Error]]" through "[[Endgame (Star Trek: Voyager)|Endgame]]") in 2378, with other sources following suit.

''[[Star Trek: Enterprise|Enterprise]]'' is set in the 2150s, and ties into the Cochrane backstory. The show uses the [[Gregorian calendar]] instead of Stardates, making tracking the dating easier. Its pilot, "[[Broken Bow (Star Trek: Enterprise)|Broken Bow]]", depicts first contact with the Klingons occurring much earlier than the Okuda chronology anticipated (it suggested a date of 2218, based on a line in "[[Day of the Dove]]", noting that dialog in [[First Contact (Star Trek: The Next Generation)|"First Contact"]] makes this problematic&nbsp;– though the actual line in the episode referred to ''hostilities'' between the two, and in ''[[Star Trek: Enterprise|Enterprise]]'', Human-Klingon relations, while by no means friendly, clearly do not rise to the de facto state of war shown in ''TOS'').  It shows the opening of the Romulan war and the start of a coalition between Earth, Vulcan, Andor, and Tellar in the 2150s. The date of the founding year of the Federation, 2161, was revealed in the fifth-season ''TNG'' episode "The Outcast," based on an early draft of the Okuda timeline. The final episode of ''[[Star Trek: Enterprise|Enterprise]]'', "[[These Are the Voyages...]]", is consistent with the establishment of 2161 as the founding year for the Federation.

No version of the ''Chronology'' or the ''Encyclopedia'' has been published since 1999. A 2006 book by [[Jeff Ayers (author)|Jeff Ayers]] contains a timeline which attempts to date all of the many [[Star Trek spin-off fiction|''Star Trek'' novels]].<ref>{{cite book|title=Voyages of the Imagination: The Star Trek Fiction Companion|publisher=Pocket Books|year=2006|isbn=1-4165-0349-8|author=Ayers, Jeff}}</ref> This timeline has ''The Motion Picture'' in 2273, to account for the two-and-a-half-year gap between the end-date of 2270 established in "Q2" and the events of the movie. The official website, [[StarTrek.com]], still gives the date of that movie as 2271.<ref>{{cite web|author=Ayers, Jeff|url=http://www.startrek.com/startrek/view/series/MOV/001/synopsis/81.html|title=Star Trek: The Motion Picture: Synopsis|publisher=startrek.com|access-date=2006-12-04|archive-date=2009-01-31|archive-url=https://web.archive.org/web/20090131231831/http://startrek.com/startrek/view/series/MOV/001/synopsis/81.html|url-status=dead}}</ref>

===Eugenics Wars and World War III===
When the original series of ''Star Trek'' was produced, the 1990s were several decades away, and so various elements of the backstory to ''Star Trek'' are set in that era, particularly the Eugenics Wars. The references to the Eugenics Wars and to a nuclear war in the 21st century are somewhat contradictory.

The episode "[[Space Seed]]" establishes the Eugenics Wars, and has them lasting from 1992 to 1996. The Eugenics Wars are described as a global conflict in which the progeny of a [[human genetic engineering]] project, most notably [[Khan Noonien Singh]], established themselves as supermen and attempted [[world government|world domination]]. Spock calls them "the last of your so-called World Wars", and McCoy identifies this with the Eugenics Wars.

In the episode "[[Bread and Circuses (Star Trek: The Original Series)|Bread and Circuses]]", Spock gives a death toll for World War III of 37 million. The episode "[[The Savage Curtain]]" features a [[Colonel Phillip Green]], who led a genocidal war in the 21st century. The ''TNG'' episode "[[Encounter at Farpoint]]" further establishes a "post-atomic horror" on Earth in 2079.  However, the movie ''Star Trek: First Contact'' put the contact between Vulcans and humans at April 5, 2063.

The ''[[Star Trek Concordance]]'' identifies the "Bread and Circuses" figure as the death toll for a nuclear [[World War III]], in the mid-21st century. ''[[Star Trek: First Contact]]'' firmly establishes World War III ended, after a nuclear exchange, in 2053, but with a body count of 600 million. The figure of Colonel Green is elaborated on in ''[[Star Trek: Enterprise]]''. ''[[Star Trek: First Contact|First Contact]]'' also deliberately describes the warring parties in World War III as "factions", not nations ''[[wikt:per se|per se]]''.

The ''Voyager'' episode "[[Future's End]]" saw the ''Voyager'' crew time-travel to [[Los Angeles]] in 1996, which, as the ''Encyclopedia'' notes, seems entirely unaffected by the Eugenics Wars, which ended that year. The episode acknowledges the issue only by featuring a model of Khan's DY-100-class ship on a 1996 desk.<ref name=encyclopedia>{{cite book|title=[[The Star Trek Encyclopedia]]|last1=Okuda|first1=Mike|first2=Denise|last2=Okuda|last3=Mirek|first3=Debbie|publisher=Pocket Books|isbn=0-671-53609-5|year=1999}}</ref> Khan's spaceship is another anomaly for the timeline, which has a variety of long-lost spaceships being launched between 1980 and 2100, with inconsistent levels of technology (caused by the increasing real lifetime and also decreased optimism about the pace of space exploration).

A reference in the ''Deep Space Nine'' episode "[[Doctor Bashir, I Presume?]]" suggests that the Eugenic Wars instead took place in the 22nd century. According to writer [[Ronald D. Moore]], this was not an attempt at a [[Retroactive continuity|retcon]], but a mistake&nbsp;– when writing the episode, he recalled the already questionable "two centuries ago" line from "Space Seed" and forgot that ''DS9'' takes place over 100 years later.<ref>{{cite web|url=http://www.geocities.com/Hollywood/6952/ron5.txt|title=Answers|date=1997-03-03|author=Ronald D. Moore|access-date=2006-12-31|archive-url=https://web.archive.org/web/20090803081246/http://geocities.com/Hollywood/6952/ron5.txt|archive-date=2009-08-03}}</ref>

Season 4 of ''[[Star Trek: Enterprise]]'' involves a trilogy of episodes ("[[Borderland (Star Trek: Enterprise)|Borderland]]", "[[Cold Station 12]]", and "[[The Augments]]") related to scientist Doctor [[Arik Soong]], ancestor of Doctor [[Noonien Soong]], and his genetic augmentations of Humans. Numerous historical details of the devastating Eugenics Wars are discussed: the death of 35–37 million people; how Earth's governments could not decide on the fate of the 1,800 genetically enhanced embryos; and how Soong had infiltrated the complex and stolen and raised 19 embryos himself. Soong maintained that he himself and humanity in general had learned the lessons of the Eugenics Wars and should not continue to hide behind those events when there was progress to be made now that the technology had matured and was much more practicable. (The actions of his "children" convince him otherwise, and at the end of "The Augments" Soong declares his interest in cybernetics, beginning the work which would one day bring about [[Data (Star Trek)|Data]].)

[[Greg Cox (writer)|Greg Cox]]'s two-book series ''[[The Eugenics Wars: The Rise and Fall of Khan Noonien Singh]]'' develops the idea of the Eugenics Wars in the context of real-life history by representing it as a secret history, and that the truth behind the various civil wars and conflicts in the 1990s was not generally known; Los Angeles, whose appearance in "Future's End" helped bring the war's existence into question, is portrayed as an EW "battlefront", the [[1992 Los Angeles riots|Rodney King riots]] being one such calamity.

The series ''[[Star Trek: Strange New Worlds]],'' which first aired in spring 2022, complicates the timeline further by retconning certain dating aspects by explicitly dating the Eugenics Wars to the first half of the 21st century. For example, the episode "Tomorrow and Tomorrow and Tomorrow" features a young Khan Noonien-Singh, long before his insurrection, and is set in the 2020s, and in the series premiere "Strange New Worlds", [[Christopher Pike (Star Trek)|Christopher Pike]] describes footage from [[George Floyd protests|real-life events from 2020]] and [[January 6 United States Capitol attack|2021]] as the prelude to the second American Civil War and leading up to the Eugenics Wars and World War III. This differs from "Space Seed" asserting that not only did the Eugenics Wars take place in the mid-1990s but dialogue indicates that they were either concurrent with or simply were World War III.

===Cochrane===
In the episode "[[Metamorphosis (Star Trek: The Original Series)|Metamorphosis]]", it is stated that [[Zefram Cochrane]] of Alpha Centauri, the discoverer of the space warp, disappeared 150 years ago, at the age of 87. Based on the 2207 to 2212<ref name=mr_scott /> <!-- page 12 ---> date originally given this would have put Cochrane's disappearance between 2057 and 2062 and his birth between 1970 and 1975.  However, Okuda's date of 2267 for that episode, puts Cochrane's disappearance in 2117 and birth in 2030. 1980s spin-off material such as the ''[[Star Trek Spaceflight Chronology]]'' posit that Cochrane was from Alpha Centauri originally, and that a sub-warp ship the UNSS ''Icarus'' arrived at Alpha Centauri in 2048 to find he had discovered the theory behind warp drive. The ''Icarus'' then relayed its findings back to Earth. The first prototype warp ship was launched in 2055.

The ''Star Trek Chronology'' does not hold with this theory, and asserts that Cochrane was an Earth native, who moved to Alpha Centauri later in life. (Even in "Metamorphosis", before Cochrane identifies himself to the landing party, Dr. McCoy had taken a tricorder scan and determined him to be human.) The first edition ''Chronology'' notes that Cochrane's invention of warp drive must have been at least 200 years before "[[Where No Man Has Gone Before]]", and suggests a date of 2061, noting that Cochrane would be 31 that year.

The film ''[[Star Trek: First Contact]]'' prominently features Cochrane's first successful warp flight. The film is set in 2063, two years after the ''Chronology'' suggestions, and therefore by the timeline Cochrane is 33. The actor who played Cochrane in that movie, [[James Cromwell]], was 56 at the time of the film's release. The ''Encyclopedia'' notes the age issue, and claims that the Cromwell Cochrane had suffered from radiation poisoning, causing his aged appearance. ''[[Star Trek: Enterprise|Enterprise]]'' pins down Cochrane's disappearance to 2119, making Cochrane instead 31 at the time of ''First Contact''.

==See also==
* [[Outline of Star Trek|Outline of ''Star Trek'']]

==Notes==
{{refbegin}}
# {{note|1}}Except for the series finale&nbsp;– "These Are the Voyages..."
# {{note|2}}The events of "These are the voyages..." are displayed as a holodeck simulation. Episode itself takes place in 2370 (stardate 47457.1)
# {{note|3}}The film begins in the main timeline only to set up the alternate timeline.
# {{note|4}}Stardate 47457.1, parallel with ''The Next Generation'' episode "Pegasus"
{{refend}}

==References==
{{reflist|colwidth=30em}}

==External links==
* [http://en.memory-alpha.org/wiki/Category:Timeline Memory Alpha, the ''Star Trek'' wiki: Category:Timeline]

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[[Category:Star Trek]]
[[Category:Timelines of mass media|Star Trek]]