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In November 1699 it had been decided that Sweden would begin to adopt the New Style, or the Gregorian calendar, starting in 1700. The process would be to gradually reduce one day per year, over a period of 11 years. (Some sources say the plan was to skip all leap days in the period 1700 to 1740, thus gradually approaching the Gregorian Calendar over 40 years.) According to plan one leap day was reduced in 1700, but no further reductions were made in the following years. In January 1711, King Charles XII declared that Sweden would abandon the calendar, which wasn't in use by any other nation nor having achieved its objective, in favor of a return to the Old Style. An extra day was added to February in the leap year of 1712, thus giving it a unique 30 day length.

In 1753 Sweden introduced the New Style, whereby the leap of 11 days was accomplished by letting February 17 be immediately followed by March 1. Despite this, Sweden did not accept the Gregorian rules for determining Easter until 1844.

See also

• Leap year
• Holidays in SwedenAll official holidays in Sweden are established by acts of Parliament. The official holidays can be divided into Christian and Non-Christian holidays. The main Christian holidays are Christmas, Epiphany, Easter, Ascension day, Pentecost and All Saints.
• Flag days in SwedenBy Swedish law a number of days of the calendar year are designated as official flag days. This means that the Flag of Sweden is flown on all public flag poles and buildings. Hoisting of the Swedish flag on private flag poles on these days is also strongl
• Namesdays in SwedenNamesdays or name days are a Swedish tradition of attaching personal names to each day of the year, and celebrating the association of particular days with those having this name. For example, the name of January 28 is Karl (or spelled in another way: Car