ADDDATE/SUBDATE(t,a) 

ADDDATE(t,a) and SUBDATE(t,a) are date functions that calculate a date in the future or past.

Value t: When used in a function, the expression t (date_or_timestamp_expression) must supply a date, a time stamp, or an alphanumeric value that matches the current date or time stamp format.

Value a: The expression a (expression) supplies a numeric value that represents the number of days. Any decimal places in a are truncated if necessary.

	Result of the Function ADDDATE(t,a)/SUBDATE(t,a)
Addition of a to t/ Subtraction of a from t	Date value or time stamp value
t or a is NULL value	NULL value
a is a special NULL value	Error message

SELECT arrival, ADDDATE(arrival,2) arrival2, rno
FROM reservation WHERE rno = 130

Postponing the reservation date by two days

ARRIVAL	ARRIVAL2	RNO
2005-02-01	2005-02-03	130