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  2. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    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.

  3. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 January 2025" is ten days after "15 January 2025". The date of a particular event depends on the observed time zone.

  4. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    A full calendar system has a different calendar date for every day. [20] [21] Thus the week cycle is by itself not a full calendar system; [22] neither is a system to name the days within a year without a system for identifying the years. The simplest calendar system just counts time periods from a reference date. [23]

  5. List of date formats by country - Wikipedia

    en.wikipedia.org/wiki/List_of_date_formats_by...

    ddd – three-letter abbreviation for day of the week, ... (dd.mm.yyyy) [21] ... in Persian Calendar system ("yy/m/d" is a common alternative). Gregorian dates follow ...

  6. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    Similarly, the last ISO week of a year may have up to three days that are actually in the Gregorian calendar year that is starting; if three, they are Friday, Saturday, and Sunday. The Thursday of each ISO week is always in the Gregorian calendar year denoted by the ISO week-numbering year. Examples: Monday 29 December 2008 is written "2009-W01-1"

  7. Calendar week - Wikipedia

    en.wikipedia.org/?title=Calendar_week&redirect=no

    Weeks This page was last edited on 1 January 2022, at 23:46 (UTC) . Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ; additional terms may apply.