Leap Day: February 29 - Time and Date
https://www.timeanddate.com/date/leap-day.html
A leap day was added every four years. At the time, leap day was February 24, and February was the last month of the year. Too Many Leap Years. However, adding a leap day every four years was too often and eventually, in 1582, Pope Gregory XIII introduced the Gregorian Calendar. This calendar, which we still use today, has a more precise ...
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