DATEADD (datepart, interval, date_exp)
Returns a new DATETIME value based on adding an interval to a date. For example, a datapart day, an interval of 11, and a date_exp of January 26, 2020, returns February 6, 2020.
Datepart specifies the part of the date to which interval is added, and must be one of the following values.
Interval specifies a positive or negative integer value used to increment datepart. If interval contains a fractional portion, the fraction part is ignored.
Date_exp is an expression that returns a DATETIME value, a value that can be implicitly converted to a DATETIME value, or a character string in a DATE format