Date Difference Calculator
Find the exact time between two dates — in days, weeks, months or years.
How long between two dates
Working out the gap between two dates — how many days until a deadline, how long since an event, the span of a project — is more error-prone by hand than it looks, once months and leap years are involved. This counts the exact difference between two dates in whichever units you need.
Enter two dates and see the difference.
Days are exact, months less so
A useful distinction: counting in days is unambiguous, but counting in months and years is not always, because months vary in length. The gap from the 31st of one month to the 30th of the next is a judgement call, and different tools handle it slightly differently. For precise work — interest, notice periods, countdowns — the day count is the figure to trust. For a rough sense of duration, months and years are fine, just understand they involve a small approximation baked into the calendar.
Frequently asked questions
What units can it show the difference in?
Days, weeks, months and years, so you can express the gap however suits.
Which figure is the most exact?
The day count, since it is unambiguous. Months and years involve small approximations because month lengths vary.
Is anything uploaded?
No. The calculation happens in your browser.