ISO week calendar
Week 20 2027
ISO week 20 of 2027 runs from Monday, May 17, 2027 to Sunday, May 23, 2027.
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 20 2027
ISO week 20 of 2027 runs from Monday, May 17, 2027 to Sunday, May 23, 2027.
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 17, 2027
- Week ends
- Sunday, May 23, 2027
- ISO year
- 2027
- Weeks in ISO year
- 52
ISO week 20, 2027
- MonMay 17, 2027Week start
- TueMay 18, 20272027-W20
- WedMay 19, 20272027-W20
- ThuMay 20, 20272027-W20
- FriMay 21, 20272027-W20
- SatMay 22, 20272027-W20
- SunMay 23, 2027Week end
Method
Find the Monday of ISO week 1, then add seven days for each week after it.
ISO week context
Week 20 2027 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 20 of 2027 starts on Monday, May 17, 2027.
When does this ISO week end?
Week 20 of 2027 ends on Sunday, May 23, 2027.