How the difference is counted

The calculator counts whole calendar days between the two dates — the end date itself is not included, so Monday to Friday of the same week is 4 days. Working days count Monday through Friday in the same start-inclusive, end-exclusive window; public holidays are not subtracted, since they vary by country.

Counting days across a daylight-saving change still gives whole days: the maths is done on calendar dates, not 24-hour blocks. For week-based planning, see the ISO week number tool; for precise durations between two timestamps, convert both with the epoch converter and subtract.