Does the day count include the end date?

The day difference counts elapsed calendar days from the start date up to, but not including, the end date.

What counts as a business day?

Business days count Monday through Friday only. Public holidays are not excluded in this first version.

What happens when adding months to the 31st?

If the target month has fewer days, the date is clamped to the last valid day of that month.

Are date inputs stored?

No. Date calculations run locally in the browser and are cleared when the page is refreshed.

Date Calculator - Days Between Dates

Date Calculator

Calculate days between dates, business days, weeks, and add or subtract years, months, weeks, and days.

Days between dates

Start date

End date

Total days

Business days

Weeks

4+ 2 days

Direction

Forward

Add or subtract dates

Base date

AddSubtract

Years

Months

Weeks

Days

Result date

2026-06-23

Calculate date differences and future dates

Use this date calculator to count days between two dates, estimate business days, and add or subtract years, months, weeks, and days from a calendar date.

Common date calculator use cases

Find the number of days or weeks between two dates.
Add days, weeks, or months to calculate deadlines and due dates.
Estimate weekdays between dates for work planning.
Plan events, renewals, travel dates, and project schedules.

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Date Calculator FAQ

Does the day count include the end date?: The day difference counts elapsed calendar days from the start date up to, but not including, the end date.
What counts as a business day?: Business days count Monday through Friday only. Public holidays are not excluded in this first version.
What happens when adding months to the 31st?: If the target month has fewer days, the date is clamped to the last valid day of that month.
Are date inputs stored?: No. Date calculations run locally in the browser and are cleared when the page is refreshed.