Sweden temporarily adopts February 30, 1712, as a day to adjust the Swedish Calendar to the Julian calendar.

In 1700, Sweden, which included Finland at the time, 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.

Sweden’s final conversion to the Gregorian calendar occurred in 1753, when an 11-day correction was applied so that February 17 was succeeded by March 1 that year. Not everyone was pleased with the calendar reform. Some people believed it stole 11 days of their lives.