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Day of the week always precedes the date (nedelja, 31. 12. 2006), is separated by comma, but can be abbreviated to the first three letters, which are then capitalized (NED, 31. 12. '06.) – note that in that case, the shortest date format is used. Starting day of the week is Monday, and the weekend falls on Saturday and Sunday.
All examples use example date 2021-03-31 / 2021 March 31 / 31 March 2021 / March 31, 2021 – except where a single-digit day is illustrated. Basic components of a calendar date for the most common calendar systems: D – day; M – month; Y – year; Specific formats for the basic components: yy – two-digit year, e.g. 24; yyyy – four-digit ...
The expanded form of the date (e.g., 31. 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 .
For example, the Gregorian date Wednesday, 12 February 2025 corresponds to day number 3 in the week number 07 of 2025, and is written as 2025-W07-3 (in extended form) or 2025W073 (in compact form). The ISO year is slightly offset to the Gregorian year; for example, Monday 30 December 2019 in the Gregorian calendar is the first day of week 1 of ...
The little-endian format (day, month, year; 1 June 2022) is the most popular format worldwide, followed by the big-endian format (year, month, day; 2006 June 1). Dates may be written partly in Roman numerals (i.e. the month) [citation needed] or written out partly or completely in words in the local language.
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 overall function, , normalizes the result to reside in the range of 0 to 6, which yields the index of the correct day of the week for the date being analyzed. The reason that the formula differs between calendars is that the Julian calendar does not have a separate rule for leap centuries and is offset from the Gregorian calendar by a fixed ...
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 10 February 2025 is 2460717.