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February 30
February 30 occurs in some calendars but not in the Gregorian calendar, where February contains only 28 or, in a leap year, 29 days. February 30 is usually used as a sarcastic date for referring to something that will never happen or will never be done.〔(【引用サイトリンク】url=http://urbanlegends.about.com/library/weekly/aa020399.htm )〕 February 30 has, however, been a real date.〔http://www.timeanddate.com/date/february-30.html〕
==Swedish calendar==
Instead of changing from the Julian calendar to the Gregorian calendar by omitting a block of consecutive days as had been done in other countries, the Swedish Empire planned to change gradually by omitting all leap days for the entire period from 1700 to 1740 inclusive. Although the leap day was omitted in February 1700, the Great Northern War began later that year, diverting the attention of the Swedes from their calendar so that they did not omit leap days on the next two occasions and 1704 and 1708 remained leap years.
To avoid confusion and further mistakes, the Julian calendar was restored in 1712 by adding an extra leap day, thus giving that year the only known actual historical use of the 30th of February in a calendar. That day corresponded to February 29 in the Julian calendar and to March 11 in the Gregorian calendar.〔
The Swedish conversion to the Gregorian calendar was finally accomplished in the usual way in 1753, by omitting the last 11 days of February.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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