Syntax:
DATE_ADD(date,INTERVAL expr unit), DATE_SUB(date,INTERVAL expr unit)

These functions perform date arithmetic. The date argument specifies
the starting date or datetime value. expr is an expression specifying
the interval value to be added or subtracted from the starting date.
expr is evaluated as a string; it may start with a - for negative
intervals. unit is a keyword indicating the units in which the
expression should be interpreted.

URL: https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html

