February 30, 1712. Sweden added an extra leap day. February 30, 1930 and 1931 were in the Soviet calendar.
In 1700 Sweden planned to convert from the Julian calendar to the Gregorian calendar. Therefore 1700, which should have been a leap year in the Julian calendar, was not a leap year in Sweden. However, 1704 and 1708 became leap years by error. This left Sweden out of synchronization with both the Julian and the Gregorian calendars, so the country reverted back to the Julian calendar.
February 30 1712 came into existence in Sweden when the Julian calendar was restored and two leap days were added that year.
February 30 existed from 1930-1931 after the Soviet Union introduced a revolutionary calendar in 1929. This calendar featured five-day weeks, 30-day months for every working month, and the remaining five or six days were “monthless” holidays.
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