Does this include the start or end day?

The day count is the calendar difference between the two dates (end minus start), so it doesn't double count the start day.

Can I subtract days instead of adding?

Yes, enter a negative number in the "days to add" field to move backward from your base date.

Date Calculator

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

Mode

Start date

End date

Result Pick your dates above

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Two ways to calculate dates

Use "Days between two dates" to find the exact number of days (and weeks) separating two calendar dates — useful for deadlines, pregnancy due dates, or event planning. Use "Add / subtract days" to find what date falls a certain number of days before or after a starting date — enter a negative number to go backward.

Frequently asked questions

Does this include the start or end day?: The day count is the calendar difference between the two dates (end minus start), so it doesn't double count the start day.
Can I subtract days instead of adding?: Yes, enter a negative number in the "days to add" field to move backward from your base date.