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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 Time (SDT) and Daylight Saving Time (DST) offsets from UTC in hours and minutes. For zones in which Daylight Saving is not observed, the DST offset shown in this table is a simple duplication of the SDT offset. The UTC offsets are based on the current or upcoming database rules.
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).
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.
Long date with weekday: onsdag(,) den 21. december 1994. Numeric date: 1994-06-07 [48] (The format dd.mm.(yy)yy is the traditional Danish date format. [49] The international format yyyy-mm-dd or yyyymmdd is also accepted, though this format is not commonly used. The formats d. 'month name' yyyy and in handwriting d/m-yy or d/m yyyy are also ...
Many existing file formats, communications protocols, and application interfaces employ a variant of the Unix time_t date format, storing the number of seconds since the Unix Epoch (midnight UTC, 1 January 1970) as an unsigned 32-bit binary integer. This value will roll over on 7 February 2106 at 06:28:16 UTC.
Date Time Group format, used most often in operation orders. This format uses DDHHMMZMONYY, with DD being the two-digit day, HHMM being the time on a 24-hour clock, Z being the timezone code, MON being the three-letter month, and YY being the two-digit year. For example, 041200ZFEB23 is noon, UTC, on 4 Feb 2023. [13]
At 18:36:57 UTC on Wednesday, 17 October 1973, the first appearance of the date in ISO 8601 format [b] (1973-10-17) within the digits of Unix time (119731017) took place. At 01:46:40 UTC on Sunday, 9 September 2001, the Unix billennium (Unix time number 1 000 000 000 ) was celebrated. [ 40 ]