Leap Year
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A year with an extra day (Feb 29) to synchronize the calendar year with the astronomical year. Every 4 years, except centuries not divisible by 400.
leap = (y \bmod 4 = 0) \land (y \bmod 100 \neq 0 \lor y \bmod 400 = 0)
Equivalents
- jp
- 閏年
- kr
- 윤년