Export (0) Print
Expand All


Evaluates the expression at the first date of the month in the current context.





An expression that returns a scalar value.


A column that contains dates.


(optional) An expression that specifies a filter to apply to the current context.

A scalar value that represents the expression evaluated at the first date of the month in the current context.

Note Note

To understand more about how context affects the results of formulas, see Context in DAX Formulas.

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.

Note Note

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

Note Note

The filter expression has restrictions described in the topic, CALCULATE Function.

This DAX function is not supported for use in DirectQuery mode. For more information about limitations in DirectQuery models, see  http://go.microsoft.com/fwlink/?LinkId=219172.


The following sample formula creates a measure that calculates the 'Month Start Inventory Value' of the product inventory.

To see how this works, create a PivotTable and add the fields, CalendarYear, MonthNumberOfYear and DayNumberOfMonth, to the Row Labels area of the PivotTable. Then add a measure, named Month Start Inventory Value, using the formula defined in the code section, to the Values area of the PivotTable.


Was this page helpful?
(1500 characters remaining)
Thank you for your feedback

Community Additions

© 2015 Microsoft