Wiki143:Date math

Date math on Wikipedia is done with variables, templates and the #time parser function.

In articles, it is almost always preferred to specify a specific static date for a statement or event rather than an automatically generated date. Wikipedia:As of describes how to properly specify such dates.

Current date and time

Built-in variables	Templates based on them	What you see	Comments
{{CURRENTTIMESTAMP}}		20251222155213
{{CURRENTYEAR}}		2025
	Template:Tl	Template:UTC	also uses {{CURRENTMONTH}} {{CURRENTDAY2}} {{CURRENTTIME}}
	Template:Tl	REDIRECT Template:Currentdate	also uses {{CURRENTTIME}} {{CURRENTDAYNAME}} {{CURRENTMONTHNAME}} {{CURRENTDAY}}
	Template:Tl	2461032.1612616	current Julian day also uses {{CURRENTMONTH}} {{CURRENTDAY}} {{CURRENTHOUR}} Template:Tl Template:Tl
{{CURRENTMONTH}}		12
	Template:Tl	12	trims leading zero
{{CURRENTMONTHNAME}}		December
	Template:Tl	January
	Template:Tl	November
	Template:Tl	October
{{CURRENTDAY}}		22	day of month
{{CURRENTDOW}}		1	day of week
	{{#time:l|-1 day}}	Sunday
	{{#time:l}}	Monday
	{{#time:l|+1 day}}	Tuesday
Any variable or template with a resolution of smaller than one day should not be placed in articles. These variables only indicate when the article was parsed and cached; they may lag by many hours or even days compared to the time the page is viewed.
{{CURRENTTIME}}		15:52
{{CURRENTHOUR}}		15
	{{#time:H|+1 hour}}	16
	Template:Tl	Template:Current hour	trims leading zero
{{#time:i}}		52
	Template:Tl	52
	Template:Tl	52	trims leading zero
{{#time:s}}		13
	Template:Tl	13

Computed date and time

Template name	Usage	Output	Comment
Template:Tl	{{Ordinal date|year=2007|month=03|day=15}}	74	returns ordinal date (day of year)
	{{Ordinal date|year=2008|month=03|day=15}}	75	+1 due to leap year in 2008
Template:Tl	{{WEEKDAY|2009|08|25}}	REDIRECT Template:Weekday	returns day of week
	{{WEEKDAYNAME|{{WEEKDAY|2009|08|25}}}}
Template:Tl	{{JULIANDAY|2009|08|25}}	2455069
	{{WEEKDAYNAME|{{JULIANDAY|2009|08|25}}}}	Tuesday	Note: 2455069 mod 7 = 1
	{{JULIANDAY|{{CURRENTYEAR}}|{{CURRENTMONTH}}|{{CURRENTDAY}}}}	2461032	Nesting templates to get the value of the current Julian day with no decimal portion. Useful for date math between a set point and the current date.
Template:Tl	{{JULIANDAY.TIMESTAMP|2455069}}	Template:JULIANDAY.TIMESTAMP	same format as {{CURRENTTIMESTAMP}}
	{{#time:D Y-m-d|{{JULIANDAY.TIMESTAMP|2455069}}}}

Julian dates or day numbers can be used for date calculations. A simple example follows:

1. 90 days from 25 December 2006 is:
   • Code: {{#time:j F Y|{{JULIANDAY.TIMESTAMP|{{JULIANDAY|2006|12|25}}+90}}}}
2. 90 days from 25 December 2007 is: (1 day less than first example due to leap year in 2008)
   • Code: {{#time:j F Y|{{JULIANDAY.TIMESTAMP|{{JULIANDAY|2007|12|25}}+90}}}}

Fancy stuff

Today is Monday 22 December 2025	Template:Tomorrow cell
Template:Tl	Template:Tl

See also

• Category:Date mathematics templates
• Help:Variables