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Gregorian Leap Year Checker

A February 29 does not imply a lunar leap month. Check the Gregorian year.

Free · No account required

WORKED EXAMPLE

Year:2024

2024 · Leap year, 366 days

A Gregorian leap year is divisible by 4 except century years not divisible by 400. The result lists all twelve month lengths.

MonthDays
131
229
331
430
531
630
731
831
930
1031
1130
1231

How this tool counts

A Gregorian leap year is divisible by 4 except century years not divisible by 400. The result lists all twelve month lengths.

When to use it

Check year length and February dates. Lunar leap months follow a different system and have their own tool.

Sources & further checking

Read the calendar conventions ↗

Explore the calendar here. Find NineHound’s founder, Lao Heshan Daoren / Sun Xingzhe, and the wider I Ching and life-chart project.
About NineHound & our methods

@ninehound.east ↗