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ISO 8601 is an international standard covering the worldwide exchange and communication of date and time-related data.It is maintained by the International Organization for Standardization (ISO) and was first published in 1988, with updates in 1991, 2000, 2004, and 2019, and an amendment in 2022. [1]
Standard format: 1- or 2-digit day, the spelled-out month, and 4-digit year (e.g. 4 February 2023) Civilian format: spelled out month, 1-or 2-digit day, a comma, and the 4-digit year (e.g. February 4, 2023). [12] Date Time Group format, used most often in operation orders. This format uses DDHHMMZMONYY, with DD being the two-digit day, HHMM ...
Date and time notation around the world varies.. An approach to harmonize the different notations is the ISO 8601 standard.. Since the Internet is a main enabler of communication between people with different date notation backgrounds, and software is used to facilitate the communication, RFC standards and a W3C tips and discussion paper were published.
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).
The ISO 8601 format YYYY-MM-DD (2025-03-04) 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.
Highlighting a specific date based on a timestamp is somewhat more difficult, because you can't just pass the date into this template, you have to calculate the week number and day of week. Luckily, we have ParserFunctions that can parse all sorts of time data (in which there are even ready-made functions to get zero-padded ISO 8601 numbers: W ...
Mission control center's board with time data, displaying coordinated universal time with ordinal date (without year) prepended, on October 22, 2013 (i.e.2013-295). An ordinal date is a calendar date typically consisting of a year and an ordinal number, ranging between 1 and 366 (starting on January 1), representing the multiples of a day, called day of the year or ordinal day number (also ...
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.