Date Calculator
Work out how far apart two dates are, or find the date that is a number of days before or after a given date.
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How it works
Difference: the two dates are reduced to whole-day counts, then expressed as days, whole weeks, and an approximate number of months (days ÷ 30.44, the average month length).
Add / subtract: the number of days is added to or removed from the start date using the calendar, so it correctly handles month lengths and leap years.
Frequently asked questions
How is the month difference calculated?
Months vary in length, so we use the average month of 30.44 days to give an approximate figure. The exact day and week counts are always precise.
Does it handle leap years?
Yes. Adding or subtracting days uses the real calendar, so February 29th and leap-year lengths are handled correctly.