Challenge date calculator
Pick a start date and a length - get your finish date and every milestone on the way.
Common challenge end dates
Starting today, 2 October 2026:
| Challenge length | Finish date |
|---|---|
| 21 days (habit kick-start) | 22 October 2026 |
| 30 days (classic month) | 31 October 2026 |
| 66 days (habit-formation average) | 6 December 2026 |
| 75 days (75 Hard) | 15 December 2026 |
| 100 days (#100DaysOfCode) | 9 January 2027 |