ISO week calendar
Week 16 2026
ISO week 16 of 2026 runs from Monday, April 13, 2026 to Sunday, April 19, 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 16 2026
ISO week 16 of 2026 runs from Monday, April 13, 2026 to Sunday, April 19, 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, April 13, 2026
- Week ends
- Sunday, April 19, 2026
- ISO year
- 2026
- Weeks in ISO year
- 53
ISO week 16, 2026
- MonApr 13, 2026Week start
- TueApr 14, 20262026-W16
- WedApr 15, 20262026-W16
- ThuApr 16, 20262026-W16
- FriApr 17, 20262026-W16
- SatApr 18, 20262026-W16
- SunApr 19, 2026Week end
Method
Find the Monday of ISO week 1, then add seven days for each week after it.
ISO week context
Week 16 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 16 of 2026 starts on Monday, April 13, 2026.
When does this ISO week end?
Week 16 of 2026 ends on Sunday, April 19, 2026.