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  2. List of date formats by country - Wikipedia

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

    Short format: dd/mm/yyyy (Day first, month number and year in left-to-right writing direction) in Afar, French and Somali ("d/m/yy" is a common alternative). Gregorian dates follow the same rules but tend to be written in the yyyy/m/d format (Day first, month number, and year in right-to-left writing direction) in Arabic language.

  3. 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.

  4. Solar Hijri calendar - Wikipedia

    en.wikipedia.org/wiki/Solar_Hijri_calendar

    This average is just 0.00000026 (2.6 × 10 −7) of a day shorter than Newcomb's value for the mean tropical year of 365.24219878 days, but differs considerably more from the mean vernal equinox year of 365.242362 days, which means that the new year, intended to fall on the vernal equinox, would drift by half a day over the course of a cycle.

  5. List of Islamic years - Wikipedia

    en.wikipedia.org/wiki/List_of_Islamic_years

    This is a list of Hijri years (Latin: anno Hegirae or AH) with the corresponding common era years where applicable. For Hijri years since 1297 AH (1879/1881 CE), the Gregorian date of 1 Muharram, the first day of the year in the Islamic calendar, is given.

  6. List of adoption dates of the Gregorian calendar by country

    en.wikipedia.org/wiki/List_of_adoption_dates_of...

    Year Date of the last day before the change Date of the first day after the change Days omitted Particulars Source Albania: Albania 1912 14 Nov 28 Nov 13 Albanian Catholics have used the Gregorian calendar since 5 Oct 1583. [3] [4] Armenia: Transcaucasian Democratic Federative Republic: 1918 17 Apr 1 May 13 [5] Austria Carinthia: 1583 14 Dec 25 ...

  7. Tabular Islamic calendar - Wikipedia

    en.wikipedia.org/wiki/Tabular_Islamic_calendar

    There is another version where, in addition, the fourth leap day is postponed to year 11 and the last leap day is in the last year of the 30-year cycle. The mean number of days per month in the 30-year cycle is 29.53056 days, or 29d 12h 44m. Six months of 29 days and six with 30 days, plus 11 days of the leap years.

  8. 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.

  9. Islamic calendar - Wikipedia

    en.wikipedia.org/wiki/Islamic_calendar

    Islamic calendar stamp issued at King Khalid International Airport on 10 Rajab 1428 AH (24 July 2007 CE). The Hijri calendar (Arabic: ٱلتَّقْوِيم ٱلْهِجْرِيّ, romanized: al-taqwīm al-hijrī), or Arabic calendar, also known in English as the Muslim calendar and Islamic calendar, is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days.