OPENINGBALANCEMONTH Function (DAX)
Evaluates the expression at the first date of the month in the current context.
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.
Constraints on Boolean expressions are described in the topic, CALCULATE Function (DAX).
The filter expression has restrictions described in the topic, CALCULATE Function (DAX).
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.