STARTOFMONTH

STARTOFMONTH is a DAX function that returns the first date of the month for a given date.

Syntax

STARTOFMONTH( Dates )

Argument	Properties	Description
Dates		The name of a column containing dates or a one column table containing dates.

Return Values

A table containing a single column and single row with a date value.

Remarks

• The dates argument can be any of the following:

  • A reference to a date/time column.
  • A table expression that returns a single column of date/time values.
  • A Boolean expression that defines a single-column table of date/time values.

• Constraints on Boolean expressions are described in the topic, CALCULATE.

• This function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.

The following sample formula creates a measure that returns the start of the month, for the current context.

= STARTOFMONTH(DateTime[DateKey])

Related functions

Other functions related to STARTOFMONTH are:

• ENDOFMONTH
• ENDOFQUARTER
• ENDOFYEAR
• STARTOFQUARTER
• STARTOFYEAR

Contribute » | Contributors: Rick de Groot
Microsoft documentation: https://learn.microsoft.com/en-us/dax/startofmonth-function-dax