DATE_ADD
Adds the given interval of time to a date or datetime object.
Syntax
DATE_ADD (dateobj, INTERVAL expr unit) ADDDATE (dateobj, INTERVAL expr unit) ADDDATE (dateobj, days)
Arguments
dateobj: a valid date, datetime, or parsable date string
expr: the number of units to add if unit is a simple type, or a string representation of the units to add if unit is a complex type. Can be negative.
days: number of days to add. Can be negative.
Simple types allowed for unit include YEAR, QUARTER, MONTH, WEEK, DAY, HOUR, MINUTE, SECOND, MICROSECOND. Complex types allowed for unit include YEAR_MONTH, DAY_HOUR, DAY_MINUTE, DAY_SECOND, DAY_MICROSECOND, HOUR_MINUTE, HOUR_SECOND, HOUR_MICROSECOND, MINUTE_SECOND, MINUTE_MICROSECOND, SECOND_MICROSECOND. The expected format of expr for complex unit types is an arbitrarily delimited string of integers.
Return Type
Date or datetime object. If dateobj is not a valid date, returns NULL.
Examples
SELECT ADDDATE("2010-04-02 01:23:54", INTERVAL 1 YEAR);
****
+-------------------------------------------------+
| ADDDATE("2010-04-02 01:23:54", INTERVAL 1 YEAR) |
+-------------------------------------------------+
| 2011-04-02 01:23:54 |
+-------------------------------------------------+
SELECT ADDDATE("2010-04-02", INTERVAL "1 02:03:04.567" DAY_MICROSECOND);
****
+------------------------------------------------------------------+
| ADDDATE("2010-04-02", INTERVAL "1 02:03:04.567" DAY_MICROSECOND) |
+------------------------------------------------------------------+
| 2010-04-03 02:03:04.567000 |
+------------------------------------------------------------------+
SELECT Emp_No, Hire_Date, DATE_ADD(Hire_Date, INTERVAL 3 MONTH) Contract_End_Date FROM Employees WHERE Emp_No = 12345; **** +--------+------------+-------------------+ | Emp_No | Hire_Date | Contract_End_Date | +--------+------------+-------------------+ | 12345 | 2014-10-28 | 2015-01-28 | +--------+------------+-------------------+