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Last week we already dealt with the topic of the correct calculation of the ISO week in DAX. Since the question came up about how to solve this in Power Query, I will look into it this week. For the problem with calendar weeks, I would like to refer to last week’s post.

Calculation of US calendar week with Date.WeekOfYear function

Like in DAX, there is already a function in Power Query to calculate the calendar week. This is called Date.WeekOfYear and returns the US format with week start on Sunday. With an optional parameter, the