Days Between Dates Calculator
Find the exact duration between two dates, or add or subtract days from a date.
Calculated locally. Your dates never leave your browser.
Common questions
How is the duration calculated — is it just total days divided by 365?
No — the years/months/days breakdown is calendar-accurate: it counts whole calendar months first (correctly handling different month lengths and leap years), then whatever's left over as days. Total days and total weeks are also shown directly, in case that's what you actually need.
Does it matter which date I enter first?
No — enter the two dates in either order and you'll get the same duration either way.
What's the difference between this and Age Calculator?
Age Calculator is built specifically around a birth date — it also tells you days until your next birthday. This tool is for any two arbitrary dates with no birthday framing, and it adds a second mode for adding or subtracting days from a date, which Age Calculator doesn't do.
Can I subtract days from a date instead of adding?
Yes — switch to "Add or subtract days from a date" and choose Subtract to go backward from a date instead of forward.