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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 definition for week 01 is the week with the first Thursday of the Gregorian year (i.e., of January) in it. The following definitions based on properties of this week are mutually equivalent, since the ISO week starts with Monday: It is the first week with a majority (4 or more) of its days in January.
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.
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.
The ISO 8601 format YYYY-MM-DD (2025-02-13) 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.
Such designations predate both ISO 8601 and the internet era; in an earlier era, they were sufficiently unambiguous for many practical uses within a national context (for example, in railway timetables and business correspondence), but their ambiguity explains their deprecation in the internet era, when communications more often cannot rely on ...
A GeneralizedTime is a time format in the ASN.1 notation.It consists of a string value representing the calendar date, as defined in ISO 8601, a time of day with an optional fractional seconds element and the optional local time differential factor as defined in ISO 8601.
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] The name billennium is a portmanteau of billion and ...