What date was 100 days ago?

If you count back 100 days from today, you land on Monday, July 20, 2026. That day was a Monday, day 201 of 2026, in ISO week 30. The gap is 100 calendar days (14 weeks and 2 days).

Today is not counted as day 1: the first day counted is tomorrow (or yesterday when you count back). This is how deadlines, notice periods and delivery dates are usually calculated. Between the two dates there are 72 business days, Monday to Friday, before public holidays are taken off.

The answer above uses your own time zone, so it is always correct for where you are. To count from a different start date, or to skip weekends, use the calculator below.