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

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

    Present country Historic area 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 ...

  3. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The corresponding date in the Gregorian calendar is 9 February 1649, the date by which his contemporaries in some parts of continental Europe would have recorded his execution. The O.S./N.S. designation is particularly relevant for dates which fall between the start of the "historical year" (1 January) and the legal start date, where different.

  4. 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.

  5. Conversion between Julian and Gregorian calendars - Wikipedia

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

    Within these tables, January 1 is always the first day of the year. The Gregorian calendar did not exist before October 15, 1582. Gregorian dates before that are proleptic, that is, using the Gregorian rules to reckon backward from October 15, 1582. Years are given in astronomical year numbering.

  6. Adoption of the Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Adoption_of_the_Gregorian...

    The Gregorian calendar replaced the Burmese calendar in several mainland Southeast Asian kingdoms in the second half of the 19th century. This took place in Cambodia in 1863 and Laos in 1889. [41] In 1889, Siam also switched to the Gregorian calendar as the official civil calendar, with the Rattanakosin Era (with 1782 as Year 1). [42]

  7. Why do we have Leap Year? A guide to the calendar's bonus day

    www.aol.com/why-leap-guide-calendars-bonus...

    Each year typically has 365 days, but every four years, the calendar tacks on an extra day to the end of February, the shortest month of the year, and gives it 366.

  8. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    A mixture of Julian and Gregorian calendar, giving dates before 1582 in the Julian calendar, and dates after 1582 in the Gregorian calendar, counting 1 BC as year zero, and negative year numbers for 2 BC and earlier. French Republican Calendar: solar: Gregorian: 1793: First French Republic: In use in revolutionary France 1793 to 1805 ...

  9. Solar cycle (calendar) - Wikipedia

    en.wikipedia.org/wiki/Solar_cycle_(calendar)

    The solar cycle is a 28-year cycle of the Julian calendar, and 400-year cycle of the Gregorian calendar with respect to the week. It occurs because leap years occur every 4 years, typically observed by adding a day to the month of February, making it February 29th. There are 7 possible days to start a leap year, making a 28-year sequence. [1]