Date calculator

What date was 100 days ago?

Saturday, February 7, 2026

Counting 100 days backward from today lands on Saturday, February 7, 2026. The date is calculated on a whole calendar-day basis, so Daylight Saving Time changes never shift the result.

Tracking a date that already passed? Outside is a free iPhone app with home screen countdown widgets and reminders so you can keep every important date in view.