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  2. Tabular Islamic calendar - Wikipedia

    en.wikipedia.org/wiki/Tabular_Islamic_calendar

    (29 days × 6 months + 30 days × 6 months) × 30 years + 11 leap days = 10,631 days and 10,631 / 360 = 29.53056 (360 is number of months in 30 years). And this is approximately how long it takes for the moon to make full lunar cycle. Microsoft's Kuwaiti algorithm is used in Windows to convert between Gregorian calendar dates and Islamic ...

  3. Islamic calendar - Wikipedia

    en.wikipedia.org/wiki/Islamic_calendar

    The Tabular Islamic calendar is a rule-based variation of the Islamic calendar, in which months are worked out by arithmetic rules rather than by observation or astronomical calculation. It has a 30-year cycle with 11 leap years of 355 days and 19 years of 354 days. In the long term, it is accurate to one day in about 2,500 solar years or 2,570 ...

  4. Solar Hijri calendar - Wikipedia

    en.wikipedia.org/wiki/Solar_Hijri_calendar

    It is a solar calendar and is the one Iranian calendar that is the most similar to the Gregorian calendar, being based on the Earth's orbit around the Sun. It begins on the March equinox as determined by the astronomical calculation for the Iran Standard Time meridian (52.5°E, UTC+03:30 ) and has years of 365 or 366 days.

  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. 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.

  7. Rumi calendar - Wikipedia

    en.wikipedia.org/wiki/Rumi_calendar

    The months and days of the Julian calendar were used, the year starting in March. [3] However, in 1256 AH the difference between the Hijri and the Gregorian calendars amounted to 584 years. With the change from lunar calendar to solar calendar, the difference between the Rumi calendar and the Julian or Gregorian calendar remained a constant 584 ...

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

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

    16 "11th month" 1 Jan (1896) N/A Previously used the Korean calendar. In addition to the Gregorian calendar, the Juche calendar is in use. North Macedonia: Yugoslavia: 1919 14 Jan 28 Jan 13 [25] Norway: Denmark-Norway: 1700 18 Feb 1 Mar 11 Poland: Poland: 1582 4 Oct 15 Oct 10 Local resistance [21] Poland Duchy of Prussia: 1610 22 Aug 2 Sept 10

  9. Hijri year - Wikipedia

    en.wikipedia.org/wiki/Hijri_year

    A year in the Islamic lunar calendar consists of twelve lunar months and has only 354 or 355 days in its year. Consequently, its New Year's Day occurs ten days earlier each year relative to the Gregorian calendar. The year 2025 CE corresponds to the Islamic years AH 1446 – 1447; AH 1446 corresponds to 2024 – 2025 in the Common Era. [a]