Date Difference Calculator

Days between two dates, made simple

The date difference calculator counts the exact gap between any two calendar dates. Pick a start date and an end date and it returns the total number of days, weeks, months and years between them, plus hours, minutes and seconds. The order doesn’t matter — if you enter the dates the wrong way round, the tool simply measures the distance between them.

This is the calculator people reach for to count down to a holiday, work out how long ago an event happened, measure a contract or notice period, or check how many days a project has been running. Because it uses real calendar dates, leap years and varying month lengths are handled automatically.

Inclusive vs exclusive counting

There are two common ways to count days between dates. The standard result excludes the start day and counts whole days elapsed. If you need to count both the first and last day — for example when counting nights booked or days of leave — use the “including end day” figure shown in the results, which adds one.