Why is the week number returned by SQL Server wrong? - 29 Nov 1999

A. e.g. select datepart(wk,'19990323') returns 13 when it should be 12.

This is because SQL Server starts counting weeks from Jan 1. Week 1 = Jan 1.

The ISO standard is that week 1 is the first week with 4 days in it.

You will have to write your own bit of SQL to calculate it...

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