This is a documentation subpage for Template:ISO date. It may contain usage information, categories and other content that is not part of the original template page.

This template converts dates to ISO dates (YYYY-MM-DD or YYYY-MM or YYYY as appropriate), see below for restrictions on input formats accepted.

The template may be used without any parameters, in which case it displays the current date: If no year has been specified, it displays the current year

• ((ISO date|Aug 17)) returns 2024-08-17
  
• ((ISO date)) returns 2024-08-04

The template accepts one unnamed parameter containing a date in one of the following formats:

• ((ISO date|15 January 2001)) returns 2001-01-15
• ((ISO date|15 Jan 2001)) returns 2001-01-15
• ((ISO date|15-01-2001)) returns 2001-01-15

• ((ISO date|January 15, 2001)) returns 2001-01-15
• ((ISO date|Jan 15, 2001)) returns 2001-01-15
• ((ISO date|Jan. 15, 2001)) returns 2001-01-15
• ((ISO date|01/15/2001)) returns 2001-01-15

• ((ISO date|January 2001)) returns 2001-01
• ((ISO date|Jan 2001)) returns 2001-01

• ((ISO date|2001)) returns 2001

Formats for which it can not work because #time returns an error or an incorrect ISO format:

• ((ISO date|01-15-2001)) returns Error: Invalid time. (hyphens indicate DD-MM-YYYY and 15 is an invalid month number)
• ((ISO date|15/01/2001)) returns Error: Invalid time. (slashes indicate MM/DD/YYYY and 15 is an invalid month number)
• ((ISO date|1/2001)) returns Error: Invalid time.
• ((ISO date|2001 January 15)) returns Error: Invalid time.
• ((ISO date|2001 January)) returns 2001-01-01 (expected: 2001-01)

This template also returns the date, hidden by CSS, in the ISO 8601 format needed by one or more of the following microformats:

• hAtom (class="updated")
• hAudio (class="published")
• hCalendar (class="dtstart")
• hCard (class="bday")

usually, but not always, within infobox or similar templates, or tables.

Its use in hCard is for organizations, venues and similar; use ((Birth date)) or ((Birth date and age)) for people.

Similarly, ((End date)) returns the date as hCalendar's (class="dtend").

See the microformats project for further details.

This template has no provision to deal with a date in a non-Gregorian calendar. Also, ISO 8601 requires mutual agreement among those exchanging information before using years outside the range 1583–9999 CE. Therefore, use of this template for non-Gregorian dates or dates outside that range constitutes a false claim of conformance to the ISO 8601 standard.

Any editor encountering such usage should change the date to plain text with no template; or if not confident in doing so, raise the matter on this template's talk page.

• ((Birth date))
• ((Birth date and age))
• ((Start date))