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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...

    There are only four countries which have not adopted the Gregorian calendar for civil use: Ethiopia (Ethiopian calendar), Nepal (Vikram Samvat and Nepal Sambat), Iran (Solar Hijri calendar) [1] and Afghanistan (Lunar Hijri Calendar). [2] Thailand has adopted the Gregorian calendar for days and months, but uses its own era for years: the ...

  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. October Revolution - Wikipedia

    en.wikipedia.org/wiki/October_Revolution

    The date 7 November, the anniversary of the October Revolution according to the Gregorian Calendar, was the official national day of the Soviet Union from 1918 onward and still is a public holiday in Belarus and the breakaway territory of Transnistria. Communist parties both in and out of power celebrate 7 November as the date Marxist parties ...

  7. 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.

  8. Adoption of the Gregorian calendar - Wikipedia

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

    The adoption of the Gregorian Calendar has taken place in the history of most cultures and societies around the world, marking a change from one of various traditional (or "old style") dating systems to the contemporary (or "new style") system – the Gregorian calendar – which is widely used around the world today. Some states adopted the ...

  9. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    Swedish calendar for February 1712. February 30 or 30 February is a date that does not occur on the Gregorian calendar, where the month of February contains only 28 days, or 29 days in a leap year. However, from a historical perspective February 30 has been used at least once and appears in some reform calendars.