Week numbers in MS SQL Server
To get the current ISO 8601 week number in MS SQL Server, use the following code snippet:
SELECT DATEPART(iso_week, GETDATE());
* Ensure your system or application regional settings are set to follow ISO 8601 standards (weeks start on Monday) if the output varies.
Step-by-Step Instructions
- Run: SELECT DATEPART(iso_week, GETDATE());
- iso_week is the ISO 8601 week number (SQL Server 2008 and later).
- For a specific column: DATEPART(iso_week, order_date).
Good to Know
DATEPART(week, ...) without the iso_ prefix follows the server's DATEFIRST setting and US-style numbering. There is no built-in ISO year part; derive it from the date of the week's Thursday when you need it.