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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 (2024-12-12) 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.
The year-month-day order, such as the ISO 8601 "YYYY-MM-DD" notation is popular in computer applications because it reduces the amount of code needed to resolve and compute dates. It is also commonly used in software cases where there are many separately dated items, such as documents or media, because sorting alphanumerically will ...
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 ...
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.
Date and time notation around the world varies.. An approach to harmonise 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.
2025-05-25 — ISO 8601 international representation of 2025 May 25; Examples of timestamps: 17:30:23 — time of day in an afternoon; 123478382 ns — the number of nanoseconds since boot; 17 minutes — an arbitrary minute counter that increments every 1 minute since its last manual "reset" event; Sequence number:
International standard ISO 8601 (Representation of dates and times) defines unambiguous written all-numeric big-endian formats for dates, such as 2022-12-31 for 31 December 2022, and time, such as 23:59:58 for 23 hours, 59 minutes, and 58 seconds.