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.
A column that contains dates.
A date expression.
An integer that specifies the number of intervals to add to or subtract from the dates.
The interval by which to shift the dates. The value for interval can be one of the following: year, quarter, month, day
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).
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.
The following formula returns the Internet sales for the 21 days prior to August 24, 2003.