Is 2100 a leap year?

Why 2100 is not a leap year

A year is a leap year in the Gregorian calendar when it is divisible by 4, with one exception and one exception to that exception: a year divisible by 100 is not a leap year unless it is also divisible by 400. 2100 is divisible by 4 and by 100, but not by 400, so the century exception applies: despite looking like a leap year, 2100 is a common 365-day year. This is the same reason 1900 was not a leap year.

The leap day around 2100

2100 has no February 29, February ends on the 28th. The closest leap day is in 2104, when February 29 falls on a Friday. If you are counting toward a leapling birthday or a date-sensitive deadline, that 2104 leap day is the one to watch.

2100 at a glance

2100 runs 365 days, or 52 full weeks plus 1 day. The leap year before 2100 was 2096 and the next one is 2104, keeping the familiar four-year rhythm, broken here by the century rule. To do date math across 2100, counting days to a deadline, an age, or an anniversary that crosses a leap day, use the days-between calculator, which handles leap days automatically.