Date Calculator
Find the number of days between two dates, or add days to a date.
Total days
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Usage examples
Counting down to a milestone
Find out how many days are left until an anniversary or exam, or how many days have passed since a given date.
Calculating contract or tenure length
Enter a start date and today's date to see exactly how many years, months, and days you've been somewhere.
Working out a deadline
Add or subtract a number of days from a starting date to instantly find the exact resulting date.
Frequently asked questions
Are the dates I enter sent to a server?
No. All calculations run entirely in your browser, and the dates you enter are never sent to a server.
Does it handle leap years correctly?
Yes. The calculation is based on actual calendar days, so leap years with February 29 are accounted for correctly.
What happens if I enter a negative number in Add days?
A negative number subtracts that many days from the start date, giving you an earlier date.
How is the years/months/days breakdown calculated?
Alongside the total day count, the tool also converts the gap between the two dates into calendar-based years, months, and days.