PREVIOUSMONTH

PREVIOUSMONTH is a DAX function that returns the date of the previous month.

Syntax

PREVIOUSMONTH( 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 of date values.

Remarks

• This function returns all dates from the previous month, using the first date in the column used as input. For example, if the first date in the Dates argument refers to June 10, 2009, this function returns all dates for the month of May, 2009.

• 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 calculates the ‘previous month sales’ for Internet sales.

= CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]), PREVIOUSMONTH('DateTime'[DateKey]))

Related functions

Other functions related to PREVIOUSMONTH are:

• PREVIOUSDAY
• PREVIOUSQUARTER
• PREVIOUSYEAR
• SAMEPERIODLASTYEAR

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