Date Calculator

Count the days between two dates.

FREE TO USENO SIGN-UP REQUIREDBROWSER-BASED

CALCULATION

START DATEEND DATE

DIFFERENCE

Pick two dates to see the gap.

Dates are counted in whole days. The difference is end minus start, so an earlier end date gives a negative number. Everything runs in your browser.

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How to use the date calculator

01 / STEPS

01Pick a calculation — Choose days between two dates, or add/subtract days from a date.
02Enter the dates — Fill in the date fields; for the second mode also enter how many days to shift by.
03Copy the result — Read the answer on the right and click COPY, or [ CLEAR ] to start over.

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02 / DETAILS

›Days between — Counts whole days from a start date to an end date — good for project spans and deadlines.
›Add / subtract — Shifts a date by a number of days; a negative number moves it backwards in time.
›Leap years — Month lengths and leap years are handled by the calendar math, so February is correct.

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03 / FAQ

Is the difference inclusive?

No. It counts whole days from one date to the other, so the start day is not double-counted. An earlier end date gives a negative number.

How do I subtract days?

In the add/subtract mode, enter a negative number of days to move the date backwards.

Does it handle leap years?

Yes. The calendar math accounts for leap years and varying month lengths automatically.

Can I calculate someone’s age?

Use the days-between mode with the birth date and today; divide the result by 365 for an approximate age in years.

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