DATESBETWEEN Returns a table that contains a column of dates that begins with the start_date and continues until the end_date.
Syntax
DATESBETWEEN(dates,start_date,end_date)
Parameters
Dates – A reference to a date/time column.
Start_date – A date expression.
End_date – A date expression.
Return Value
A table containing a single column of date values.
Reference Data
https://docs.microsoft.com/en-us/dax/dax-function-reference