CalculatorDate Calculator
From to
plus days
Countdown to
Three things you can do
- Days between two dates. Pick a start and end date. You get the number of days, plus the same span in years, months and days, and in weeks and days.
- Add or subtract days. Enter a date and a number of days to find the resulting date and its weekday. Use a negative number, such as −30, to go back in time.
- Countdown. Pick an event date to see how many days are left, or how many days have passed.
Including both dates
From June 1 to June 3 is 2 days. If you count both the first and the last day, as you would for vacation days or a multi-day event, it is 3 days. The calculator shows both numbers.
Examples
| Question | Answer |
|---|---|
| Jan 1, 2026 to Dec 25, 2026 | 358 days (51 weeks 1 day) |
| Nov 14, 2026 + 100 days | Monday, February 22, 2027 |
| Jan 31, 2026 to Feb 28, 2026 | 28 days (1 month 0 days) |
FAQ
Are leap years included?
Yes. February 29 is counted in leap years such as 2028.
Do time zones or daylight saving time change the result?
No. Dates are counted as whole calendar days, so the result is the same everywhere.
How are months counted?
From the same day of the month. If that day doesn't exist in the later month (one month after January 31, for example), the last day of that month is used, so January 31 to February 28, 2026 is exactly 1 month.
Related guide
- Days Between Dates: Counting, Adding and CountdownsHow to count the days between two dates, inclusive versus exclusive counting, adding days to a date, leap years and month lengths, with examples.
- Leap Years, Month Lengths and Finding the WeekdayThe 4/100/400 leap year rule and why it exists, February 29 birthdays, days in each month, and a simple method to find the weekday of any date.