How do I convert a week number to a date?
Enter the ISO year and week number. The converter returns the matching Monday–Sunday range (ISO 8601) plus the seven individual days.
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.
ISO Week to Date Converter
Today is ISO 2026-W20. Enter any year and week to get the matching Monday–Sunday dates.
- ISO code
- 2026-W20
- Monday (start)
- Monday, May 11, 2026
- Sunday (end)
- Sunday, May 17, 2026
- Total weeks in 2026
- 53
| Weekday | Date | ISO |
|---|---|---|
| Monday | Monday, May 11, 2026 | 2026-05-11 |
| Tuesday | Tuesday, May 12, 2026 | 2026-05-12 |
| Wednesday | Wednesday, May 13, 2026 | 2026-05-13 |
| Thursday | Thursday, May 14, 2026 | 2026-05-14 |
| Friday | Friday, May 15, 2026 | 2026-05-15 |
| Saturday | Saturday, May 16, 2026 | 2026-05-16 |
| Sunday | Sunday, May 17, 2026 | 2026-05-17 |
Frequently asked questions
What exactly is an ISO 8601 week?
ISO 8601 weeks start on Monday, and week 1 is the week containing the first Thursday of the year.
Why do some years have 53 weeks?
When January 1 (or January 1–2 in a leap year) is a Thursday, the ISO year contains 53 weeks.