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  2. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    259 week years are 1 day shorter than the month years (364 − 365). Weeks per month. The ISO standard does not define any association of weeks to months. A date is either expressed with a month and day-of-the-month, or with a week and day-of-the-week, never a mix.

  3. Determination of the day of the week - Wikipedia

    en.wikipedia.org/wiki/Determination_of_the_day...

    The Rata Die method works by adding up the number of days d that has passed since a date of known day of the week D. The day of-the-week is then given by (D + d) mod 7, conforming to whatever convention was used to encode D. For example, the date of 13 August 2009 is 733632 days from 1 January AD 1. Taking the number mod 7 yields 4, hence a ...

  4. French Republican calendar - Wikipedia

    en.wikipedia.org/wiki/French_Republican_calendar

    The French Republican calendar ( French: calendrier républicain français ), also commonly called the French Revolutionary calendar ( calendrier révolutionnaire français ), was a calendar created and implemented during the French Revolution, and used by the French government for about 12 years from late 1793 to 1805, and for 18 days by the ...

  5. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  6. Week - Wikipedia

    en.wikipedia.org/wiki/Week

    A week is a unit of time equal to seven days. It is the standard time period used for short cycles of days in most parts of the world. The days are often used to indicate common work days and rest days, as well as days of worship. Weeks are often mapped against yearly calendars, but are typically not the basis for them, as weeks are not based ...

  7. ISO 8601 - Wikipedia

    en.wikipedia.org/wiki/ISO_8601

    The separator used between date values (year, month, week, and day) is the hyphen, while the colon is used as the separator between time values (hours, minutes, and seconds). For example, the 6th day of the 1st month of the year 2009 may be written as "2009-01-06" in the extended format or simply as "20090106" in the basic format without ambiguity.

  8. Byzantine calendar - Wikipedia

    en.wikipedia.org/wiki/Byzantine_calendar

    Kyriake was seen as the day of resurrection of Christ and as both the first and eighth day of the week, in the same way that Christ was the alpha and omega of the cosmos, existing both before and after time. The second day of the week recognized angels, "the secondary luminaries as the first reflections of the primal outpouring of light", just ...

  9. Date and time notation in the United States - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    In traditional American usage, dates are written in the month–day–year order (e.g. June 2, 2024) with a comma before and after the year if it is not at the end of a sentence [2] and time in 12-hour notation (5:14 am). International date and time formats typically follow the ISO 8601 format (2024-06-02) for all-numeric dates, [3] write the ...