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. : DATE_ADD « Date Time Functions « MySQL Tutorial

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MySQL Tutorial » Date Time Functions » DATE_ADD

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.


mysql>

mysql> SELECT DATE_ADD('1998-01-30', INTERVAL 1 MONTH);

+------------------------------------------+

| DATE_ADD('1998-01-30', INTERVAL 1 MONTH) |

+------------------------------------------+

| 1998-02-28                               |

+------------------------------------------+

1 row in set (0.00 sec)



mysql>

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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