How-to · Week Number
How to Determine the Current Global ISO Week Number
Quick answer
To find the current week number under the ISO 8601 standard, locate the week that contains the first Thursday of the calendar year, designating that period as Week 01.
Step by step
- Locate the week that contains the first thursday of the calendar year
- Designating that period as week 01
Supply Chain Operations and ISO System Standards
The ISO 8601 system removes calendar confusion by standardizing week tracking across corporate networks. Under this system, a week always begins on Monday. If a year's first days fall on a Friday, Saturday, or Sunday, they are counted as part of the final week of the *previous* calendar year.
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Sources & standards