Week Number to Date
Determine the Monday date for any ISO week number in a chosen year.
For planning purposes; verify dates for official schedules.
Examples
- 2024 week 1 ⇒ 2024-01-01 (start of week 1)
- 2024 week 10 ⇒ 2024-03-04
- 2025 week 20 ⇒ 2025-05-12
FAQ
What is ISO week 1?
The week containing January 4th.
Can a year have 53 weeks?
Yes. Years starting on Thursday or leap years starting on Wednesday can have week 53.
Why does the week start on Monday?
ISO-8601 defines Monday as the first day of the week.
Additional Information
- ISO weeks always begin on Monday.
- Some years include a week 53 depending on the calendar.
- Results are returned in ISO format (YYYY-MM-DD).