How do I find the number of days between two dates?

Select "Days between dates", pick a start date and an end date, and the difference in days, weeks, months, and years is shown instantly.

How do I add or subtract days from a date?

Select "Add/subtract from date", pick a start date, enter the number of days to add (positive) or subtract (negative), and the resulting date is displayed.

Can I exclude weekends from the count?

Yes — toggle the "Business days only" option. The calculator will count only Monday–Friday when enabled.

What is the furthest date supported?

The tool uses JavaScript Date objects which support dates from 1 January 100 to 31 December 9999, covering all practical use cases.

Does the tool account for time zones?

All calculations use the local date in your browser's timezone. The results show whole calendar dates (no time component), so timezone differences do not affect the day count.

Date Calculator

Calculate days between two dates or add and subtract days from any date. Includes business days option.

Your files never leave your device

Business days only (Mon–Fri)

Start date

End date

How to Date Calculator

Choose mode: "Days between dates" or "Add/subtract from date".
For days between: pick a start date and end date — the difference is shown instantly.
For add/subtract: pick a start date and enter the number of days to add or subtract.
Toggle "Business days only" to exclude weekends from the count.

Why Use This Tool?

Project deadlines, contract durations, age calculations, and scheduling all require accurate date arithmetic. This tool handles both date difference and date offset calculations with optional weekend exclusion, all in your browser.

Date Calculator

How to Date Calculator

Why Use This Tool?

Frequently Asked Questions