Legal, contractual, court, tax, and regulatory deadlines may use specific counting rules. This calculator applies the options you select.
How to use this calculator
Enter the requested values, review any options that affect the calculation, and select Calculate. The main answer appears beside the form, with supporting details below it.
How the calculation works
Calendar days count every date. Business days skip weekends and holidays according to the selected calendar; the starting date counts only when selected.
Example
Thirty calendar days after September 29, 2026 is October 29, 2026.
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Frequently asked questions
Is this legal advice?
No. Confirm consequential deadlines with the responsible authority or a qualified professional.