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ISO 8601-2:2019 defines a set of standardised extensions to the ISO 8601 date and time formats. Extended Date/Time Format (EDTF) The EDTF is given as an example of a profile of ISO 8601.
The ISO 8601 format YYYY-MM-DD (2025-02-21) is intended to harmonize these formats and ensure accuracy in all situations. Many countries have adopted it as their sole official date format, though even in these areas writers may adopt abbreviated formats that are no longer recommended.
International standard ISO 8601 (Representation of dates and times) defines unambiguous written all-numeric big-endian formats for dates, such as 2022-12-31 for 31 December 2022, and time, such as 23:59:58 for 23 hours, 59 minutes, and 58 seconds.
Besides that, in Hungary the big-endian year-month-day order has been traditionally used. In 1995, also in Germany, the traditional notation was replaced in the DIN 5008 standard, which defines common typographic conventions, with the ISO 8601 notation (e.g., "1991-12-31"), and is becoming the prescribed date format in Germany since 1996-05-01.
A precise date is specified by the ISO week-numbering year in the format YYYY, a week number in the format ww prefixed by the letter 'W', and the weekday number, a digit d from 1 through 7, beginning with Monday and ending with Sunday. For example, the Gregorian date Friday, 21 February 2025 corresponds to day number 5 in the week number 08 of ...
In communications messages, a date-time group (DTG) is a set of characters, usually in a prescribed format, used to express the year, the month, the day of the month, the hour of the day, the minute of the hour, and the time zone, if different from Coordinated Universal Time (UTC).
This also works when a time in 24-hour format is included after the date, as long as all times are understood to be in the same time zone. ISO 8601 is used widely where concise, human-readable yet easily computable and unambiguous dates are required, although many applications store dates internally as UNIX time and only convert to ISO 8601 for ...
ISO 8601 is an international standard for communicating certain information, in particular between computer systems. The information comprises certain units of time which would normally be called "dates and times" from millennia (and with extensions larger units) down to seconds and decimal fractions thereof (for example 12:34 on 10 April 1962), and other time-like entities which we need not ...