Leap Year Calculator

Enter any year to see whether February has 29 days.

Year

2028 is a leap year366 days

Core timing workflows

Start with a direct timer, stopwatch, alarm or focus workflow. Calendar, date arithmetic, clocks and scheduling specialists remain available from the full Date & Time hub.

All 76 date & time tools

Online TimerCountdown, sound, repeat & fullscreen StopwatchLaps, precision & fullscreen Countdown TimerFocused countdown workflow Alarm ClockAlarm at a local clock time PomodoroFocus and break cycles Interval TimerWork/rest rounds Presentation TimerTalk timing with warnings Classroom TimerProjector-friendly countdown

Leap-year range scanner & next/previous check

Check one year and scan a range using Gregorian century rules, then see nearby leap years instead of a single yes/no result.

YearRange startRange end

—Selected year

—Leap years in range

—Next leap year

—Previous leap year

Ready.

Leap year

Calendar or duration rule

Leap years are divisible by 4, except century years unless divisible by 400.

1900 is not a leap year; 2000 is.

Worked check

Use century years as a quick rule check: 1900 is not a leap year because it is divisible by 100 but not 400, while 2000 is a leap year because it is divisible by 400.

Rule: Leap years are divisible by 4, except century years unless divisible by 400. 1900 is not a leap year; 2000 is. For a final check, distinguish calendar arithmetic from elapsed duration, confirm the intended local date or time zone, and inspect month-end, leap-year or daylight-saving boundaries when they can affect the meaning.