Sweden has a curious history. Sweden decided to make a gradual change

from the Julian to the Gregorian calendar. By dropping every leap year

from 1700 through 1740 the eleven superfluous days would be omitted and

from 1 Mar 1740 they would be in sync with the Gregorian calendar. (But

in the meantime they would be in sync with nobody!)

 

So 1700 (which should have been a leap year in the Julian calendar) was

not a leap year in Sweden. However, by mistake 1704 and 1708 became leap

years. This left Sweden out of synchronisation with both the Julian and

the Gregorian world, so they decided to go back to the Julian calendar.

In order to do this, they inserted an extra day in 1712, making that

year a double leap year! So in 1712, February had 30 days in Sweden.

 

Later, in 1753, Sweden changed to the Gregorian calendar by dropping 11

days like everyone else.

 

 

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