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  2. Soviet calendar - Wikipedia

    en.wikipedia.org/wiki/Soviet_calendar

    The Soviet calendar was a modified Gregorian calendar that was used in Soviet Russia between 1918 and 1940. Several variations were used during that time. The Gregorian calendar, under the name "Western European calendar", was implemented in Soviet Russia in February 1918 by dropping the Julian dates of 1–13 February 1918.

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

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

    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 Southern Ducal Prussia is now ...

  4. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    Soviet Union: Gregorian calendar with 5- and 6-day weeks, used during 1929 to 1940. World Calendar: solar: Gregorian: 1930 — Perpetual calendar with 1–2 off-week days, preferred and almost adopted by the United Nations in 1950s Pax Calendar: solar: Gregorian: 1930 — Leap week calendar: Pataphysical calendar: solar: Gregorian: 1949 ...

  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. Date and time notation in Russia - Wikipedia

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

    Russia used the Byzantine calendar up to 1700, the Julian calendar between 1700 and 1918, and the Gregorian calendar since 1918. Until the final years of Peter the Great in the early 1720s, Russia used Cyrillic numerals to denote dates on coins.

  7. Adoption of the Gregorian calendar - Wikipedia

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

    The months and days are those of the Gregorian calendar, but the year is either the "Western calendar" (西暦, seireki) year number per the Common Era or Anno Domini system, or a year of the nengō of the emperor on the throne. Since 1873, an era and the first year of that era has begun on the day of the year that the emperor ascended the throne.

  8. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The calendar year has 13 months with 28 days each, divided into exactly 4 weeks (13 × 28 = 364). An extra day added as a holiday at the end of the year (after December 28, i.e. equal to December 31 Gregorian), sometimes called "Year Day", does not belong to any week and brings the total to 365 days.

  9. 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.