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Applies to: 
Calculated column
Calculated table
Measure 
Visual calculation
Note
This function is discouraged for use in visual calculations as it likely returns meaningless results.
For date column input, returns the first date of month in the current context for the specified column of dates.
For calendar input, returns a table for first date of month, in the current context. A table that contains all primary tagged columns and all time related columns.
Syntax
STARTOFMONTH(<dates> or <calendar>)
Parameters
| Term | Definition |
|---|---|
dates or calendar |
A column that contains dates or a calendar reference |
Return value
For date column input, a table containing a single column and single row with a date value.
For calendar input, a table that contains all primary tagged columns and all time related columns.
Remarks
The
datesargument 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])
Example for calendar based time intelligence
The following sample formula creates a table that returns tagged primary columns that corresponds to the start of the month, for the fiscal calendar.
= STARTOFMONTH(FiscalCalendar)
Related content
Date and time functions Time intelligence functions STARTOFYEAR STARTOFQUARTER STARTOFWEEK