DATE_ADD(date,INTERVAL expr unit) : DATE_ADD « Date Time Functions « MySQL Tutorial

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MySQL Tutorial » Date Time Functions » DATE_ADD

14.10.1.DATE_ADD(date,INTERVAL expr unit)

expr is an expression specifying the interval value.

expr is a string.

expr may start with a '-' for negative intervals.

unit is a keyword indicating the units in which the expression should be interpreted.

The following table shows the expected form of the expr argument for each unit value.

unit Value	Expected expr Format
MICROSECOND	MICROSECONDS
SECOND	SECONDS
MINUTE	MINUTES
HOUR	HOURS
DAY	DAYS
WEEK	WEEKS
MONTH	MONTHS
QUARTER	QUARTERS
YEAR	YEARS
SECOND_MICROSECOND	'SECONDS.MICROSECONDS'
MINUTE_MICROSECOND	'MINUTES.MICROSECONDS'
MINUTE_SECOND	'MINUTES:SECONDS'
HOUR_MICROSECOND	'HOURS.MICROSECONDS'
HOUR_SECOND	'HOURS:MINUTES:SECONDS'
HOUR_MINUTE	'HOURS:MINUTES'
DAY_MICROSECOND	'DAYS.MICROSECONDS'
DAY_SECOND	'DAYS HOURS:MINUTES:SECONDS'
DAY_MINUTE	'DAYS HOURS:MINUTES'
DAY_HOUR	'DAYS HOURS'
YEAR_MONTH	'YEARS-MONTHS'

14.10.DATE_ADD
	14.10.1.	DATE_ADD(date,INTERVAL expr unit)
	14.10.2.	DATE_ADD(curdate(), INTERVAL 1 MICROSECOND);
	14.10.3.	DATE_ADD(curdate(), INTERVAL 1 MINUTE);
	14.10.4.	DATE_ADD(curdate(), INTERVAL 1 HOUR);
	14.10.5.	DATE_ADD(curdate(), INTERVAL 1 DAY);
	14.10.6.	DATE_ADD(curdate(), INTERVAL 1 WEEK);
	14.10.7.	DATE_ADD(curdate(), INTERVAL 1 MONTH);
	14.10.8.	DATE_ADD(curdate(), INTERVAL 1 QUARTER);
	14.10.9.	DATE_ADD(curdate(), INTERVAL 1 YEAR);
	14.10.10.	DATE_ADD(curdate(), INTERVAL 1.1 SECOND_MICROSECOND)
	14.10.11.	DATE_ADD(curdate(), INTERVAL 1 SECOND);
	14.10.12.	DATE_ADD(curdate(), INTERVAL 1.1 SECOND);
	14.10.13.	DATE_ADD(curdate(), INTERVAL 1.1 MINUTE_MICROSECOND);
	14.10.14.	DATE_ADD(curdate(), INTERVAL 1.1 MINUTE_SECOND);
	14.10.15.	DATE_ADD(curdate(), INTERVAL 1.1 HOUR_MICROSECOND);
	14.10.16.	DATE_ADD(curdate(), INTERVAL 1.1 HOUR_SECOND);
	14.10.17.	DATE_ADD(curdate(), INTERVAL '1:1:1' HOUR_SECOND);
	14.10.18.	DATE_ADD(curdate(), INTERVAL 1.1 HOUR_MINUTE); (with dot)
	14.10.19.	DATE_ADD(curdate(), INTERVAL '1:1' HOUR_MINUTE);
	14.10.20.	DATE_ADD(curdate(), INTERVAL 1.1 DAY_MICROSECOND);
	14.10.21.	DATE_ADD(curdate(), INTERVAL '1 1:1:1' DAY_SECOND);
	14.10.22.	DATE_ADD(curdate(), INTERVAL '1 1:1' DAY_MINUTE);
	14.10.23.	DATE_ADD(curdate(), INTERVAL '1 1' DAY_HOUR);(wihtout :)
	14.10.24.	DATE_ADD(curdate(), INTERVAL 1.1 SECOND_MICROSECOND); (with dot)
	14.10.25.	DATE_ADD(curdate(), INTERVAL '1-1' YEAR_MONTH); (with minus sign)
	14.10.26.	DATE_ADD(curdate(), INTERVAL '1.1' YEAR_MONTH); (with dot)
	14.10.27.	Adding one day to a date: SELECT DATE_ADD('2006-05-01',INTERVAL 1 DAY);
	14.10.28.	Adding one month to a date: SELECT DATE_ADD('2006-05-01',INTERVAL 1 MONTH);
	14.10.29.	Adding one year to a date: SELECT DATE_ADD('2006-05-01',INTERVAL 1 YEAR);
	14.10.30.	Adding one month to start date
	14.10.31.	SELECT DATE_ADD('1997-12-31 23:59:59', 1 SECOND);
	14.10.32.	SELECT DATE_ADD('1997-12-31 23:59:59', 1 DAY);
	14.10.33.	SELECT DATE_ADD('1997-12-31 23:59:59', '1:1' MINUTE_SECOND);
	14.10.34.	SELECT DATE_SUB('1998-01-01 00:00:00', '1 1:1:1' DAY_SECOND);
	14.10.35.	SELECT DATE_ADD('1998-01-01 00:00:00', '-1 10' DAY_HOUR);
	14.10.36.	SELECT DATE_SUB('1998-01-02', INTERVAL 31 DAY);
	14.10.37.	SELECT DATE_ADD('1992-12-31 23:59:59.000002', '1.999999' SECOND_MICROSECOND);
	14.10.38.	If you add to or subtract from a date value something that contains a time part, the result is automatically converted to a datetime value.
	14.10.39.	SELECT DATE_ADD('1999-01-01', INTERVAL 1 HOUR);
	14.10.40.	If the resulting date has a day that is larger than the maximum day for the new month, the day is adjusted to the maximum days in the new month.
	14.10.41.	Date arithmetic operations require complete dates
	14.10.42.	SELECT '2005-03-32' + INTERVAL 1 MONTH;

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