What Is a Leap Year?
6. February 30
The countries Sweden and Finland chose to do things a little differently, although they still use the Gregorian calendar as much of the rest of the world does. To help make up the difference in lost time, they both added 2 leap days in 1712, meaning that on that year they also had February 30.
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Even the wonderful fantasy world of J. R. R. Tolkien uses something similar to the Gregorian calendar, albeit with some differences. For starters every day of the 12 months of the Hobbit calendar has 30 days. Including the 30th day of Solmath (which equates to February).
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