Years Calculator

Find the exact calendar gap plus total months, total days, and decimal years between dates.

Start date

End date

—Exact calendar difference

—Decimal years

—Complete months

—Total days

—Calendar years/months/days are calculated without using an average month length.

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

Calendar years, months, days & anniversary evidence

Measure a date span as completed calendar years plus remaining months and days, while also showing total days and the next anniversary date. This avoids treating every year as a fixed 365-day block.

Start dateEnd dateAnniversary mode

—Calendar span

—Total days

—Next anniversary

Ready.

Calendar years are not fixed-length units

A calendar difference such as 2 years, 3 months and 4 days follows the Gregorian calendar, while decimal years and total days are continuous summaries. Leap years and different month lengths mean those two descriptions are not interchangeable; use the one that matches the question you are answering.