What date was 100 days ago?
100 days ago was Sunday, June 28, 2026
Counting from today, Tuesday, October 6, 2026. That date was day 179 of 2026, in ISO week 26.
| Date | Sunday, June 28, 2026 |
|---|---|
| Calendar days since | 100 |
| Weekdays (Mon–Fri) in that span | 72 |
| Weekends in that span | 14 |
| In weeks | 14 weeks, 2 days |
| In hours | 2,400 |
| 100 business days ago | Tuesday, May 19, 2026 |
Starting on a different day?
The same 100 days, counted from each of the next eight days.
| Start date | 100 days earlier |
|---|---|
| Today | Sunday, June 28, 2026 |
| Tomorrow | Monday, June 29, 2026 |
| Thursday, October 8 | Tuesday, June 30, 2026 |
| Friday, October 9 | Wednesday, July 1, 2026 |
| Saturday, October 10 | Thursday, July 2, 2026 |
| Sunday, October 11 | Friday, July 3, 2026 |
| Monday, October 12 | Saturday, July 4, 2026 |
| Tuesday, October 13 | Sunday, July 5, 2026 |
How 100 days ago is counted
Today counts as day zero and every calendar day after it counts as one, weekends included. So the answer is simply today's date minus 100 days. People most often look this up for the first 100 days of a new job or term in office, and 100-day challenges.
Need a different number? The add or subtract days tool takes any figure, and the countdown calendar works the other way — pick a date and see how far away it is.
Questions
What date was 100 days ago?
100 days ago was Sunday, June 28, 2026, counting from Tuesday, October 6, 2026.
How many weeks is 100 days?
100 days is 14 weeks and 2 days — about 3.3 months.
Does the count include today?
No. Today is day zero, so yesterday was 1 day ago. This is the usual way deadlines are counted.
What about 100 business days ago?
Skipping Saturdays and Sundays changes the answer — the table above shows the business-day date. Public holidays are not skipped, so remove any that apply where you are.