DATEADD - Daxplained

DATEADD is a DAX function that moves a given set of dates by a specified interval.

Syntax

DATEADD(
   Dates,
   NumberOfIntervals,
   Interval
)

Argument	Properties	Description
Dates		The name of a column containing dates or a one column table containing dates.
NumberOfIntervals		The number of intervals to shift.
Interval		One of: Day, Month, Quarter, Year.

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 single-column table of date/time values.

Note

Constraints on Boolean expressions are described in the topic, CALCULATE function.
If the number specified for number_of_intervals is positive, the dates in dates are moved forward in time; if the number is negative, the dates in 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 exist in the dates column.
If the dates in the current context do not form a contiguous interval, the function returns an error.
This function is not supported for use in DirectQuery mode when used in calculated columns or row-level security (RLS) rules.

The following formula calculates dates that are one year before the dates in the current context.

= DATEADD(DateTime[DateKey],-1,year)

Other functions related to DATEADD are:

Contribute » | Contributors: Rick de Groot
Microsoft documentation: https://learn.microsoft.com/en-us/dax/dateadd-function-dax