DATESINPERIOD Function (DAX)
Returns a table that contains a column of dates that begins with the start_date and continues for the specified number_of_intervals.
DATESINPERIOD(<dates>,<start_date>,<number_of_intervals>,<interval>)
Parameters
Term  Definition 
dates  A column that contains dates. 
start_date  A date expression. 
number_of_intervals  An integer that specifies the number of intervals to add to or subtract from the dates. 
interval  The interval by which to shift the dates. The value for interval can be one of the following: year , quarter , month , day 
A table containing a single column of date values.
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 singlecolumn table of date/time values.



If the number specified for number_of_intervals is positive, the dates are moved forward in time; if the number is negative, the dates are shifted back in time.
The interval parameter is an enumeration, not a set of strings; therefore values should not be enclosed in quotation marks. Also, the values: year
, quarter
, month
, day
should be spelled in full when using them.
The result table includes only dates that appear in the values of the underlying table column.
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 formula returns the Internet sales for the 21 days prior to August 24, 2007.
= CALCULATE(SUM(InternetSales_USD[SalesAmount_USD]),DATESINPERIOD(DateTime[DateKey],DATE(2007,08,24),21,day))
Time Intelligence Functions (DAX)
Date and Time Functions (DAX)
DATESBETWEEN Function (DAX)
Get Sample Data