Uncommon
February 29
Day of the year
February 29
February 29 is known as a leap day (or "leap year day"), which is periodically added as the last day of the month to the Julian and Gregorian calendars, as an intercalary date, to create leap years. Its main function is to keep the calendars aligned with the Earth's seasons, as the planet orbits the sun. In the older Julian calendar, leap days are added to every year that is evenly divisible by four. However, this causes the calendar to slowly become misaligned with the Earth's seasons, by about 3 days every 400 years. (The Julian calendar continues to be used in some places as the basis for their liturgical calendar). The Gregorian calendar is the standard civil calendar used in most of the world, and is a slight modification of the Julian calendar. In this calendar, a centennial year does not have a February 29 (despite being evenly divisible by 4) unless it is also evenly divisible by 400. Thus, in contrast to the Julian calendar, the years 1700, 1800 and 1900 did not have leap year...
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