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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]
The ISO 8601 format YYYY-MM-DD (2025-01-05) 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.
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.
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 ...
The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2024b of the tz database. [2]
Since portions of the population continued to use the old format, the traditional format was re-introduced as alternative to the standard YYYY-MM-DD format to DIN 5008 in 2001 and DIN ISO 8601 in September 2006 but its usage is restricted to contexts where misinterpretation cannot occur. The expanded form of the date (e.g., 31.
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 Monday, 6 January 2025 corresponds to day number 1 in the week number 02 of ...
The little-endian format (day, month, year; 1 June 2022) is the most popular format worldwide, followed by the big-endian format (year, month, day; 2006 June 1). Dates may be written partly in Roman numerals (i.e. the month) [citation needed] or written out partly or completely in words in the local language.