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  2. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    The number of days between two dates, which is simply the difference in their Julian day numbers. The dates of moveable holidays, like Christian Easter (the calculation is known as Computus) followed up by Ascension Thursday and Pentecost or Advent Sundays, or the Jewish Passover, for a given year. Converting a date between different calendars.

  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. Unit of time - Wikipedia

    en.wikipedia.org/wiki/Unit_of_time

    10 days. A period of time analogous to the concept of "week", used by different societies around the world: the ancient Egyptian calendar, the ancient Chinese calendar, and also the French Republican calendar (in which it was called a décade). megasecond: 10 6 s: About 11.6 days. fortnight: 2 weeks: 14 days lunar month: 27 d 4 h 48 min – 29 ...

  5. AOL Calendar - AOL Help

    help.aol.com/products/aol-calendar

    Learn how to set your time zone, default view, and hours of availability in the AOL Calendar settings. Calendar · Oct 28, 2023 Create, share, or subscribe to a calendar

  6. 360-day calendar - Wikipedia

    en.wikipedia.org/wiki/360-day_calendar

    The 360-day calendar is a method of measuring durations used in financial markets, in computer models, in ancient literature, and in prophetic literary genres.. It is based on merging the three major calendar systems into one complex clock [citation needed], with the 360-day year derived from the average year of the lunar and the solar: (365.2425 (solar) + 354.3829 (lunar))/2 = 719.6254/2 ...

  7. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    Also, a calendar may, by identifying a day, provide other useful information about the day such as its season. Calendars are also used as part of a complete timekeeping system: date and time of day together specify a moment in time. In the modern world, timekeepers can show time, date, and weekday. Some may also show the lunar phase.

  8. Lunar month - Wikipedia

    en.wikipedia.org/wiki/Lunar_month

    Because of these two variations in angular rate, the actual time between lunations may vary from about 29.274 days (or 29 d 6 h 35 min) to about 29.829 days (or 29 d 19 h 54 min). [6] The average duration in modern times is 29.53059 days with up to seven hours variation about the mean in any given year.

  9. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    If conversion takes you past a February 29 that exists only in the Julian calendar, then February 29 is counted in the difference. Years affected are those which divide by 100 without remainder but do not divide by 400 without remainder (e.g., 1900 and 2100 but not 2000).