Time
Pie Chart of the Gregorian Leap Year Cycle
Last reviewed on 2026-05-22.
Time — verifiable data, editable template
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In any 400-year period of the Gregorian calendar, 97 years are leap years and 303 are common years. The rule: divisible by 4, except centuries not divisible by 400.
The data
- Common years — 303 years per 400-year cycle
- Leap years — 97 years per 400-year cycle
Source
Gregorian calendar (1582).
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