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Business Day Calculator: Working Days with Your Holidays

Count or add business days with your own holiday list and weekend definition. No holiday API exists here.

What to compute
Weekend
Rules this tool follows
  • Half-open counting: the start day never counts, the end day counts when it is a business day.
  • Days are calendar dates (UTC clock of the date you typed). Not 24-hour slices, so DST nights cannot split a day.
  • The holiday list is yours: pasted, validated (real dates, no duplicates), capped at 400 entries. Nothing is fetched from any holiday API.
  • Weekends are configurable: Sat+Sun is the default, Fri+Sat and Sun-only presets cover the common non-Western calendars.
Nothing in yet

Paste, drop, or type to begin. Everything stays on this device.

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