How do I calculate days between two dates?

Enter a start date and end date into the date calculator and it instantly shows the difference in years, months, days, as well as total weeks and total days between the two dates.

Can I add or subtract days from a date?

Yes. Use the "Add / Subtract Days" section. Enter a starting date and the number of days to add or subtract. The calculator shows the resulting date and what day of the week it falls on.

Does the calculator account for leap years?

Yes, the date calculator uses the actual calendar including leap years, so February 29 and varying month lengths are handled correctly.

How many weeks are between two dates?

The calculator divides the total number of days by 7 to show total weeks. For example, 30 days apart equals 4 weeks and 2 days.

Date Calculator — Free Online Tool

Date Calculator

Find the difference between two dates or add/subtract days from a date.

Processed locally in your browser

Date Difference

Find the duration between two dates

Start Date

End Date

Add / Subtract Days

Calculate a new date by adding or subtracting days

Start Date

Number of Days

Operation

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How to Use

Calculate the difference between dates or add/subtract days with this free date calculator.

Date Difference. Pick a start date and an end date. The calculator shows the difference in years, months, days, total weeks, and total days.
Add or Subtract Days. Pick a starting date, enter the number of days, and choose to add or subtract. The calculator shows the resulting date.
Copy any result with one click.

All calculations run in your browser — no data is sent anywhere.

Features

✓Difference between two dates
✓Add or subtract days from a date
✓Result in years, months, days
✓Total weeks and total days
✓Weekday of the result date
✓Fully client-side — no data leaves your browser

Frequently Asked Questions

How do I calculate days between two dates?: Enter a start date and end date into the date calculator and it instantly shows the difference in years, months, days, as well as total weeks and total days between the two dates.
Can I add or subtract days from a date?: Yes. Use the "Add / Subtract Days" section. Enter a starting date and the number of days to add or subtract. The calculator shows the resulting date and what day of the week it falls on.
Does the calculator account for leap years?: Yes, the date calculator uses the actual calendar including leap years, so February 29 and varying month lengths are handled correctly.
How many weeks are between two dates?: The calculator divides the total number of days by 7 to show total weeks. For example, 30 days apart equals 4 weeks and 2 days.