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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 UTC offsets are based on the current or upcoming database rules. This table does not attempt to document any of the historical data which resides in the database. In Ireland , what Irish law designates as "standard time" is observed during the summer, with clocks turned one hour ahead of 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.
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.
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 value assigned to this parameter must either be in ISO 8601 format without time zone designator (2024-12-20T04:08:27), or YYYYMMDDhhmmss format as output by {} (20241220040827). This is interpreted by the template as UTC.
ISO gives an ISO 8601 style yyyy-mm-dd (e.g. 2007-05-31) none applies no formatting whatsoever If a date to be formatted is provided but no style is specified, the template emits a date in "d month yyyy" format, as it appears (for example) on discussion pages.
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...