Date & Time Tools

Months Between Dates

Calculate the number of full months (and leftover days) between two dates.

First date

Second date

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Choose what you want to do: add days, subtract days, or find days between two dates.
Enter the date(s) involved.
Read the resulting date or day count — leap years and varying month lengths are handled automatically.

Formula / logic

Days between = (later date − earlier date) in whole days. Add/subtract = start date shifted forward or backward by N days on the calendar.

Worked example

From January 1 to December 31 in a non-leap year is 364 days. Adding 30 days to January 1 lands on January 31.

Yes — the calculator uses actual calendar months, so February is handled correctly whether or not it's a leap year.

Yes, the calculation uses real calendar dates, so February 29 in a leap year is counted correctly.

The count reflects full days elapsed between the two dates; the start date itself counts as day zero.

Yes — every calculator on this site is free, with no sign-up or download required.

Yes, the layout and calculator both adapt to phone and tablet screens.