DATE_ADD()

DATE_ADD()

Description

The DATE_ADD() function adds a time/date interval to a date and then returns the date. If date is NULL, the function returns NULL.

Syntax

> DATE_ADD(date,INTERVAL expr unit)

Arguments

Arguments	Description
date	Required. The date/datetime to extract the date from.
expr	Required. The expr is an expression specifying the interval value to be added or subtracted from the starting date. The expr is evaluated as a string; it may start with a - for negative intervals.
unit	Required. The unit is a keyword indicating the units in which the expression should be interpreted. The unit argument can have the following values: MICROSECOND SECOND MINUTE HOUR DAY WEEK MONTH QUA TER YEAR SECOND_MICROSECOND MINUTE_MICROSECOND MINUTE_SECOND HOUR_MICROSECOND HOUR_SECOND HOUR_MINUTE DAY_MICROSECOND DAY_SECOND DAY_MINUTE DAY_HOUR YEAR_MONTH

Examples

create table t2(orderid int, productname varchar(20), orderdate datetime);
insert into t2 values ('1','Jarl','2008-11-11 13:23:44.657');
mysql> SELECT OrderId,DATE_ADD(OrderDate,INTERVAL 45 DAY) AS OrderPayDate FROM t2;
+---------+---------------------+
| orderid | orderpaydate        |
+---------+---------------------+
|       1 | 2008-12-26 13:23:45 |
+---------+---------------------+

Constraints

The date type supports only yyyy-mm-dd and yyyymmdd for now.