Is this calculator free?

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

Does it upload any data?

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

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

日付に営業日を加減算、または2日付間の営業日数をカウント。

Start date Business days to add (negative = subtract)

Choose a mode: Add / subtract days to find a future or past date, or Count between dates to count working days in a range.
In add mode, enter a start date and the number of business days. Use a negative number to go back in time.
In count mode, enter start and end dates to see the total weekdays between them.

Is this calculator free?: Yes, completely free with no signup and no usage limits.
Does it upload any data?: 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