Regiomontanus
The Swedish calendar used in Sweden of March 1st 1700 with the February 30th 1712 was equivalent to the Calendrier Julien but shifted one day.
In November 1699 it was decided that Sweden would start to adopt new the Gregorian Calendrier starting from 1700.
The process was to reduce gradually a day per annum, during 11 ans.
Some sources indicate that the intention was to jump every intercalary day between 1700 and 1740, therefore to approach the Gregorian calendar gradually.
According to the plan, the year 1700 which was a Leap year in the Julien calendar was not it in Sweden, but no additional reduction was made the years suivantes.
In January 1711, king Charles XII declared that Sweden would give up this calendar, which was used by no other nation and which had not achieved its goal, in favor of a return to the old calendar julien.
For resynchroniser with this one, it was necessary to add one day additional in February in 1712 which became thus doubly bissextile and having a February 30th.
In 1753, Sweden finally used the Gregorian calendar and the 11 days jump was carried out while immediately making follow the February 17th by on March 1st.
In spite of this, Sweden accepted the Gregorian rules to determine Easter only in 1844.
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