MasterTool

Working Days Calculator

Calculate working days with calendar-date arithmetic.

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What this tool does

Calculate working days with calendar-date arithmetic. Start excluded, end included. No automatic public holiday lookup; enter regional holidays manually.

How to use the Working Days Calculator

  1. Enter or select start date (yyyy-mm-dd).
  2. Enter or select end date (yyyy-mm-dd).
  3. Enter or select excluded holidays (yyyy-mm-dd, one per line; optional).
  4. Read the calculated result; change any measurement to compare alternatives.

Formula

count weekdays Monday–Friday after start through end, excluding entered holidays
start
Start date (YYYY-MM-DD)
end
End date (YYYY-MM-DD)
holidays
Excluded holidays (YYYY-MM-DD, one per line; optional)

Start excluded, end included. No automatic public holiday lookup; enter regional holidays manually.

Worked example

For working days calculator, the following measurements illustrate the exact method: Start date (YYYY-MM-DD): 2026-01-01; End date (YYYY-MM-DD): 2026-02-01; Excluded holidays (YYYY-MM-DD, one per line; optional): .

Inputs

  • Start date (YYYY-MM-DD)2026-01-01
  • End date (YYYY-MM-DD)2026-02-01
  • Excluded holidays (YYYY-MM-DD, one per line; optional)

Result

  • Business days21

Results explained

Business days
Business days from the formula above. Start excluded, end included. No automatic public holiday lookup; enter regional holidays manually.

Frequently asked questions

count weekdays Monday–Friday after start through end, excluding entered holidays

Start excluded, end included. No automatic public holiday lookup; enter regional holidays manually.

Yes. Valid calendar dates use Gregorian leap-year rules.

Date-only calculations use UTC calendar days to avoid daylight-saving shifts. Clock-time durations use the provided elapsed clock times, not a timezone database.

Check the date format, direction, whether endpoints are included, and whether holidays need to be excluded.