Add Business Days

Find the calendar date that falls a set number of business days before or after a starting point. The calculation skips Saturdays and Sundays automatically, making it handy for invoicing, compliance filings, and managing service-level agreements.

Four-digit calendar year of the starting date
Month number 1–12
Day of month 1–31
Use positive numbers to move forward and negative numbers to count backwards

Check results against your organisation’s official holiday schedule before committing to contractual deadlines.

Examples

  • Start Monday 2024-06-03 and add 10 business days ⇒ Monday, June 17, 2024 (ISO 2024-06-17).
  • Start Thursday 2024-12-19 and add 5 business days ⇒ Thursday, December 26, 2024 (ISO 2024-12-26)—note how the weekend is skipped.
  • Start Tuesday 2025-01-07 and subtract 4 business days ⇒ Tuesday, January 1, 2025 (ISO 2025-01-01).

FAQ

Does this tool account for public holidays?

No. It removes only Saturdays and Sundays. For holiday-aware planning, layer this result with your organisation’s holiday calendar or use a project management tool that supports exceptions.

Can I count backwards to find a kickoff date?

Yes. Enter a negative number of business days (for example, −15) to move backward from the starting date.

What if the start date is on a weekend?

The start date is taken as-is. If you begin on a Saturday or Sunday, the calculator counts from that day but the first business day added will still be the following Monday.

How do I include custom non-working days?

Run the calculator, then manually adjust if the resulting date falls on a company holiday. You can also export the logic into a spreadsheet and add a table of holiday dates to skip automatically.

Additional Information

  • Business days are counted Monday through Friday. Weekends are excluded; public holidays are not removed by default.
  • Negative inputs let you count backward from a target date to find when preparations must begin.
  • Combine this calculator with a regional holiday calendar to build more precise project schedules or payroll timelines.
  • The result includes both a readable long date and the ISO 8601 YYYY-MM-DD format for spreadsheets and databases.

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