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As of ISO 8601-1:2019/Amd 1:2022, "00:00:00" may be used to refer to midnight corresponding to the instant at the beginning of a calendar day; and "24:00:00" to refer to midnight corresponding to the instant at the end of a calendar day. [1] ISO 8601-1:2019 as originally published removed "24:00:00" as a representation for the end of day ...
The ISO 8601 format YYYY-MM-DD (2025-03-01) 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 ISO week date system is effectively a leap week calendar system that is part of the ISO 8601 date and time standard issued by the International Organization for Standardization (ISO) since 1988 (last revised in 2019) and, before that, it was defined in ISO (R) 2015 since 1971.
The International Fixed Calendar (also known as the Cotsworth plan, the Cotsworth calendar, the Eastman plan or the Yearal) [1] was a proposed reform of the Gregorian calendar designed by Moses B. Cotsworth, first presented in 1902. [2] The International Fixed Calendar divides the year into 13 months of 28 days each.
The month of the calendar displayed is determined by m. If m is specified, then the year can be specified with y, the default is the current year. If m is not specified but 1 is a valid time the month and/or year is set to match the title, the default is the current month and/or year.
For dates before the year 1, unlike the proleptic Gregorian calendar used in the international standard ISO 8601, the traditional proleptic Gregorian calendar (like the older Julian calendar) does not have a year 0 and instead uses the ordinal numbers 1, 2, ... both for years AD and BC. Thus the traditional time line is 2 BC, 1 BC, AD 1, and AD 2.
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 ...
A calendar date is a reference to a particular day, represented within a calendar system, enabling a specific day to be unambiguously identified. Simple math can be performed between dates; commonly, the number of days between two dates may be calculated, e.g., "25 February 2025" is ten days after "15 February 2025".