DueRule

Backward deadline calculator

Subtract business days from a date

Work backward from a known date without hiding weekends, federal closures, or the start-boundary choice.

Reviewed August 20, 2026Visible sourcesNo account

Free · no sign-in · no tracking

Calculate with the rule in view

OPM coverage 2024–2027
Calculation

Sourced profiles stop outside verified coverage. They never guess missing holidays.

How subtraction is evaluated

DueRule takes the positive magnitude you enter and moves backward one civil date at a time. Eligible dates reduce the remaining count; excluded dates appear in the audit trace.

Read the trace in order: exclusions appear in the same backward direction as the calculation.

Use sourced profiles inside their coverage

The OPM profiles stop when the calculation would leave 2024–2027. Choose Weekdays Only when you intentionally need a Monday–Friday rule with no holiday claim.

Questions people ask

Does subtract use a negative number?

No. Enter a positive whole-number magnitude and select Subtract; the mode determines the direction.

Are excluded dates listed backward?

Yes. The trace follows the calculation path, so a subtract result lists skipped dates from the start toward the earlier deadline.

Can DueRule subtract zero business days?

Yes. Zero returns the starting date unchanged.