ISO week calendar
Week 22 2026
ISO week 22 of 2026 runs from Monday, May 25, 2026 to Sunday, May 31, 2026.
Date Time Encyclopedia answer, with calculation details and assumptions below.
ISO weeks start on Monday and end on Sunday. Week 1 is the week containing the first Thursday of the ISO week-numbering year.
Snapshot
Week 22 2026
ISO week 22 of 2026 runs from Monday, May 25, 2026 to Sunday, May 31, 2026.
ISO weeks start on Monday and end on Sunday. Week 1 is the week containing the first Thursday of the ISO week-numbering year.
- Week starts
- Monday, May 25, 2026
- Week ends
- Sunday, May 31, 2026
- ISO year
- 2026
- Weeks in ISO year
- 53
ISO week 22, 2026
- MonMay 25, 2026Week start
- TueMay 26, 20262026-W22
- WedMay 27, 20262026-W22
- ThuMay 28, 20262026-W22
- FriMay 29, 20262026-W22
- SatMay 30, 20262026-W22
- SunMay 31, 2026Week end
Method
Find the Monday of ISO week 1, then add seven days for each week after it.
ISO week context
Week 22 2026 uses the ISO week-date system: weeks start Monday, end Sunday, and week 1 is tied to the first Thursday of the ISO year.
Compare nearby ISO weeks
Adjacent week pages help verify handoffs between reporting periods, sprints, payroll periods, and weekly plans.
Related Lookups
FAQ
When does this ISO week start?
Week 22 of 2026 starts on Monday, May 25, 2026.
When does this ISO week end?
Week 22 of 2026 ends on Sunday, May 31, 2026.