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Date calculator

Calculates the number of days between two dates, D-day, and the date a given number of days before or after a date. Free.

① Days between two dates · D-day

Start date

End date (target date)

② A few days before or after a date

Reference date

What is Date Calculator?

A tool that calculates the number of days between two dates (D-day) or the date a given number of days before or after a specific date. Use it for anniversaries, deadlines, and working-day counts.

How it works

1 Enter the reference date.
2 Find the number of days between two dates, or calculate a date a number of days before or after.

Frequently Asked Questions

Can I find a D-day? ⌄

Yes. You can see the days remaining until a target date right away.

Does it give a date a number of days later? ⌄

It adds or subtracts days from a specific date to compute a new date.