ISO week calendar
Week 12 2027
ISO week 12 of 2027 runs from Monday, March 22, 2027 to Sunday, March 28, 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 12 2027
ISO week 12 of 2027 runs from Monday, March 22, 2027 to Sunday, March 28, 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, March 22, 2027
- Week ends
- Sunday, March 28, 2027
- ISO year
- 2027
- Weeks in ISO year
- 52
ISO week 12, 2027
- MonMar 22, 2027Week start
- TueMar 23, 20272027-W12
- WedMar 24, 20272027-W12
- ThuMar 25, 20272027-W12
- FriMar 26, 20272027-W12
- SatMar 27, 20272027-W12
- SunMar 28, 2027Week end
Method
Find the Monday of ISO week 1, then add seven days for each week after it.
ISO week context
Week 12 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 12 of 2027 starts on Monday, March 22, 2027.
When does this ISO week end?
Week 12 of 2027 ends on Sunday, March 28, 2027.