# PREVIOUSMONTH

Returns a table that contains a column of all dates from the previous month, based on the first date in the Dates column, in the current context.

## Syntax

PREVIOUSMONTH(<Dates>)


### Parameters

Term Definition
Dates A column containing dates.

## Return value

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.

## Example

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]))