How do I subtract weeks?
Pick a start date and the number of weeks to subtract. The calculator returns the matching past date.
whatweek.ca
See what week of the year it is right now in Canada, including the current week number and the dates this week starts and ends.
Subtract Weeks from a Date
Enter a date and how many weeks to subtract to find the resulting past date.
- Resulting date
- Wednesday, April 15, 2026
- ISO
- 2026-04-15
- Weekday
- Wednesday
- ISO week
- 2026-W16
Frequently asked questions
Can I go further back in time?
Yes — there is no practical limit. You can subtract hundreds of weeks.