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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.
The ISO 8601 format YYYY-MM-DD (2024-12-11) 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.
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]
Dezember 1991) continues to use the little-endian order and the ordinal-number dot for the day of the month. Week numbers according to ISO 8601 and the convention of starting the week on Monday were introduced in the mid 1970s . These conventions have been widely adhered to by German calendar publishers since then.
Weeks are generally referred to by the date of some day within that week (e.g., "the week of May 25"), rather than by a week number. Many holidays and observances are identified relative to the day of the week on which they are fixed, either from the beginning of the month (first, second, etc.) or end (last, and far more rarely penultimate and ...
ISO 8601-conformant calendar with week numbers for any common year starting on Saturday (dominical letter B) preceded by Leap year starting on Thursday (dominical letter DC) January
The day of the week can be easily calculated given a date's Julian day number (JD, i.e. the integer value at noon UT): Adding one to the remainder after dividing the Julian day number by seven (JD modulo 7 + 1) yields that date's ISO 8601 day of the week. For example, the Julian day number of 8 December 2024 is 2460653.
How weeks are identified (see seven-day week) Whether written months are identified by name, by number (1–12), or by Roman numeral (I-XII). Whether the 24-hour clock, 12-hour clock, or 6-hour clock is used. Whether the minutes (or fraction of an hour) after the previous hour or until the following hour is used in spoken language.