Sweden tried to do this. Of course, it meant they would be out of sync with both Julian and Gregorian calendars for 40 years, so after skipping Feb 29th in 1700

Sweden tried to do this. Of course, it meant they would be out of sync with both Julian and Gregorian calendars for 40 years, so after skipping Feb 29th in 1700, they gave up and reverted the the Julian calendar in 1712 (by adding February 30th to the calendar).