# STARTOFMONTH

Returns the first date of the month in the current context for the specified column of dates.

## Syntax

STARTOFMONTH(<dates>)


### Parameters

Term Definition
dates A column that contains dates.

## Return value

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.

## Example

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

= STARTOFMONTH(DateTime[DateKey])