Free Date Calculator Online: Days Between Dates & Add Days
Calculate days between dates or add and subtract days from a date, free with no sign-up.
Find out how many days separate two dates, or what date falls 90 days from now. Handy for deadlines, pregnancies, vacations and paperwork.
By VOV · Last updated: October 21, 2026
How it works
How it works: dates are converted to milliseconds and exact calendar arithmetic is applied, accounting for leap years. Everything is computed in your browser; nothing is sent anywhere.
Use cases
- Count down how many days remain until your wedding and put the countdown on your invitations
- Find out how many days you worked this quarter to calculate your quarterly perfect-attendance bonus
- Determine the exact date 90 days from now to know when your rental contract expires
Frequently asked questions
Does it count leap years?
Yes. The calculation uses the real Gregorian calendar, so February 29ths are counted automatically.
What are weekdays here?
Monday-to-Friday days between the two dates, not counting public holidays (they differ by country, so they are not deducted).
Can I calculate a past date?
Yes: choose "Subtract" and enter the days to find out what date it was N days ago.
Are my dates stored anywhere?
No. Everything is computed in your browser and nothing is sent or stored.