How does the STARTOFMONTH function (DAX) work?

The STARTOFMONTH function (DAX) returns the first date of the month in the current context for the specified column of dates.

STARTOFMONTH Formula Syntax

STARTOFMONTH(
     <dates>
)

How do you use the STARTOFMONTH function?

This function filters <Dates> into a 1-row, 1-column table that shows only the earliest date, in the entire <Dates> column devoid of all filters, that is in the same year and month as the earliest visible date in <Dates>.

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Considerations when using the STARTOFMONTH function

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.

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Formula examples using the STARTOFMONTH function

=STARTOFMONTH(DateTime[DateKey])

= STARTOFMONTH (Sales[Date])

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