Business Day Calculator

What Business Day Calculator does

Add, subtract or count weekdays with configurable weekends and optional holiday exclusions.

Worked example

How the date or time is calculated

The calculation advances one civil day at a time and counts only days not marked as weekends or supplied holidays.

Useful workflows

• Check schedules, intervals or calendar labels before transferring them to another system.
• Compare UTC with a named local time zone instead of relying on an unexplained offset.
• Copy a result together with its date format and counting convention for later review.

Limits and important checks

• Business calendars vary by country, company, time zone and observed-holiday policy.
• Ambiguous numeric dates such as 03/04/2026 should be entered with an unambiguous format.
• For legal, payroll, travel or financial deadlines, confirm the result against the responsible authority or system.

Frequently asked questions

Which time zone is used?

The selected zone is used when shown. Otherwise the page normally uses the browser device’s current local time zone; review the displayed offset.

Why is another calendar one day or one hour different?

Check inclusive counting, midnight boundaries, daylight-saving rules, seconds versus milliseconds and the selected calendar system.