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Is there any replacement for WEEKNUM in Power BI
Is there any way to find the Week Number from a Date field using a custom column in POWER BI desktop app
These are different tools, with Query you use M language and with model DAX. Check query function here https://msdn.microsoft.com/en-us/library/mt253480.aspx .
In the Query Editor, select the date column. Go to the Add column tab. Under the Date button on the right side of the ribbon, select Week, then week of the year. That's the week number equivalent.