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The Swedish realm (which included Finland at the time) planned to change from the Julian calendar to the Gregorian calendar beginning in 1700 by omitting the leap days for the next 40 years. Thus 1700 was not a leap year in Sweden, but both 1704 and 1708 were leap years contrary to the plan. This brought the Swedish calendar one day ahead of the Julian calendar but still ten days behind the Gregorian calendar. This confusion was reduced when, in 1712, two leap days were added, thus giving that year a February 30. That date corresponded to February 29 in Julian and March 11 in Gregorian counting. The Swedish change to the Gregorian calendar was finally done in 1753.

In 1929Centuries: 19th century 20th century 21st century Decades: 1870s 1880s 1890s 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s Years: 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 See also 1929 in aviation 1929 in film 1929 in literature 1929 in mu the Soviet UnionThe Union of Soviet Socialist Republics (USSR ( Russian: ; tr. Soyuz Sovetskikh Sotsialisticheskikh Respublik (SSSR) also called the Soviet Union ( ; tr. Sovetsky Soyuz , was a state in much of the northern region of Eurasia that existed from 1922 until 1 introduced a revolutionary calendarThe Soviet revolutionary calendar was in use in the USSR from 1929 to 1940. Shortly after the Russian Revolution Lenin had decreed to change the calendar in the Soviet Union from the Julian calendar to the Gregorian calendar. This change involved bypassin in which every month had 30 days and the remaining 5 or 6 days were monthless holidayA holiday is day set aside by a nation or culture (in some cases, multiple nations and cultures) typically for celebration but sometimes for some other kind of special culture-wide (or national) observation or activity. Based on the English words holy ands. In 19301930 is the common year starting on Wednesday. see link for calendar) Events January-February January 6 The first diesel-engine automobile trip is completed ( Indianapolis, Indiana, to New York City). January 27 Miguel Primo de Rivera resigns January 30 G and 19311931 is the common year starting on Thursday. see link for calendar) Events January January 4 Female aviator Elly Beinhorn begins her flight to Africa January 6 Thomas Edison submits his last patent application. January 22 Sir Isaac Isaacs sworn in as the, it thus had a February 30, but in 19321932 is the leap year starting on Friday. see link for calendar) Events January-February January 3 British arrest and intern Mohandas Gandhi and Vallabhbhai Patel January 8 In Britain the Archbishop of Canterbury forbids church remarriage of divorcees Jan the months regained their old lengths.

It is sometimes claimed that in the Julian calendar February had 30 days in leap years from 44 BC until 8 BC, when Augustus shortened February to give the month August named after him the same length as July named after his precursor Julius Caesar. However there is no historical evidence for this, thus it is most likely a myth, albeit a very old one.