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






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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 ValueExpected expr Format
MICROSECONDMICROSECONDS
SECONDSECONDS
MINUTEMINUTES
HOURHOURS
DAYDAYS
WEEKWEEKS
MONTHMONTHS
QUARTERQUARTERS
YEARYEARS
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;