Business Days Between Two Dates in Power Query M

Calculates the number of weekdays (Monday-Friday) between two dates, excluding weekends.

Date & TimeAdvancedbusiness daysweekdaysdate

Power Query M code

let
    Source = YourTable,
    AddedBusinessDays = Table.AddColumn(Source, "BusinessDays", each
        let
            AllDates = List.Dates([StartDate], Duration.Days([EndDate] - [StartDate]) + 1, #duration(1, 0, 0, 0)),
            Weekdays = List.Select(AllDates, each Date.DayOfWeek(_, Day.Monday) < 5)
        in
            List.Count(Weekdays),
        Int64.Type)
in
    AddedBusinessDays

Generate a date table in Power Query M

Notes

This doesn't exclude holidays; combine with a holiday table and List.Contains to subtract those too.

Requirements

How to use this snippet

  1. In Power BI Desktop, choose Transform data to open Power Query, then open the Advanced Editor on a query (or start from a blank query).
  2. Paste the snippet and replace the placeholder names (tables, columns, file paths) with your own. Check the requirements above first.
  3. Run it through the Power Query M Formatter to tidy the layout.

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