Date.DayOfWeek

 

This topic applies to the Power Query Formula Language which can be used with Power Query and Power BI Desktop to build queries that mashup data. See the list of function categories.

Returns a number between 0 and 6 representing the day of the week from a DateTime value.

Date.DayOfWeek(dateTime as datetime, optional firstDay as nullable number) as nullable number  

ArgumentDescription
dateTimeThe DateTime to check against.
optional firstDayA Day type representing the first day of the week for this calculation. The default is Day.Sunday.

Enum values

  • Day.Sunday = 0;

  • Day.Monday = 1;

  • Day.Tuesday = 2;

  • Day.Wednesday = 3;

  • Day.Thursday = 4;

  • Day.Friday = 5;

  • Day.Saturday = 6;

Date.DayOfWeek(DateTime.FromText("2011-02-21")) equals 2  

Date.DayOfWeek(DateTime.FromText("2011-02-21"), Day.Monday) equals 1  

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