ISO week numbering labels weeks Monday through Sunday; week 1 contains January 4.
What Is an ISO Week Number: explained
Some ISO week-numbering years have 53 weeks.
An ISO week-year may differ from the calendar year near New Year’s.
Useful reference
There are seven days in a week. A duration in weeks and the numbered weeks on a calendar are not always interchangeable, especially around New Year’s.
When the answer can differ
Use ISO week dates when coordinating international schedules.
Common questions
What should I remember?
ISO week numbering labels weeks Monday through Sunday; week 1 contains January 4.
What is an easy mistake to avoid?
Use ISO week dates when coordinating international schedules.
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