Business days exclude Saturday and Sunday. Enable holidays and choose national coverage or a region. Only holidays on otherwise working weekdays reduce the count. Check the named list and data coverage.
Changing a country or region selects Manual mode and resets its date format and timezone. A new page without country detects IP again; include country and region in a shared calculation to select its holiday calendar.
Worked example
December 24–28, 2026 in the United States has 1 working day after Christmas and the weekend are excluded.
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