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How deadline counting works
Most “within N business days” rules count the same way: the start day itself is not counted; you step forward one calendar day at a time and count only the days that are business days, until you have counted N of them. The date you land on is the deadline. This calculator follows exactly that method, forwards (“respond within 10 business days”) or backwards (“submit 5 business days before the hearing”).
Worked example
Start Monday 5 January 2026 and count 5 business days forward with no holiday list: Tue 6 (1), Wed 7 (2), Thu 8 (3), Fri 9 (4), Mon 12 (5) — the deadline is Monday 12 January 2026. Counting backwards works the same way in reverse, which is how “no later than N business days before” dates are found.
A word of care
Organisations phrase their rules differently — some count the start day, some treat the day of receipt specially, and court and tribunal rules have their own conventions. Use this as a fast, transparent first count, then confirm against the exact wording of the rule you are working to.
Common questions
Why isn't the start date counted?
Because that is the convention behind most published “within N business days” service standards and response-time rules. If your rule says to include the trigger day, add one extra business day to your count to compensate.
What if the deadline lands on a holiday I didn't select?
Tick the holiday list for the jurisdiction the deadline belongs to (US federal or UK England & Wales, 2026). If the relevant holiday is a state, devolved, or local one not in those lists, adjust by a day manually.