Is this calculator free?

Yes, completely free with no signup and no usage limits.

Does it send any data to a server?

No. All calculations run in your browser — your dates never leave your device.

Yes. Works in Safari, Chrome, and Firefox on iOS and Android.

2つの日付の差を日・週・月・年単位で算出。

Start date End date

Show business days (Mon–Fri, excluding weekends)

Enter a start date and end date using the date pickers — the difference appears instantly.
The result updates automatically if you swap the order of the dates (the calculator always takes the absolute difference).
Check Show business days to also display the count of weekdays (Mon–Fri) between the two dates.

Is this calculator free?: Yes, completely free with no signup and no usage limits.
Does it send any data to a server?: No. All calculations run in your browser — your dates never leave your device.
Does it work on mobile?: Yes. Works in Safari, Chrome, and Firefox on iOS and Android.

Last updated: 2026-05-20 By jarvisbox