Date Calculator
Days between two dates
| Start date | |
| End date |
Result appears here.
Add or subtract days from a date
| Start date | |
| Days | days |
Result appears here.
For general information only.
How it works
This calculator can find the number of days between two dates or add/subtract days from a date.
Notes and example
- It uses calendar dates and accounts for different month lengths and leap years.
- Time zones and daylight saving time are not applied automatically unless reflected in what you enter.
Example: 2024-02-01 to 2024-03-01 is 29 days because 2024 is a leap year.
For general information only.
How to use the Date Calculator
It takes a few seconds, and every figure is calculated in your browser.
- Enter the start date.
- Enter the end date.
- Enter the number of days.
- Press Calculate — the result appears in the dark panel beside the form.
- Use Copy, CSV, Share or Print under the result if you want to keep it.
Date Calculator — frequently asked questions
How does the Date Calculator work?
This calculator can find the number of days between two dates or add/subtract days from a date.
What assumptions and limitations should I know about?
It uses calendar dates and accounts for different month lengths and leap years. Time zones and daylight saving time are not applied automatically unless reflected in what you enter. Example: 2024-02-01 to 2024-03-01 is 29 days because 2024 is a leap year.
Last updated 10 November 2026 · Formula, worked example and assumptions are documented above, and every result is calculated in your browser.