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Editor to share with you this time is how MySQL to achieve the date addition and subtraction function, the article is rich in content, interested friends can come to understand, I hope you can get something after reading this article.

1. Addtime ()

Add a specified number of seconds to the date

Select addtime (now (), 1);-add 1 second

2. Adddate ()

There are two uses. If the second parameter is to fill in the number directly, it is to add a specified number of days to the date, and to enter interval is to add a specified interval time to the date.

Select adddate (now (), 1);-- 1 day select adddate (now (), interval 1 day);-- 1 day select adddate (now (), interval 1 hour);-- 1 hour select adddate (now (), interval 1 minute);-- 1 minute select adddate (now (), interval 1 second);-- 1 second select adddate (now (), interval 1 microsecond);-- 1 millisecond select adddate (now (), interval 1 week) -- 1 week select adddate (now (), interval 1 month);-- 1 month select adddate (now (), interval 1 quarter);-- 1 season select adddate (now (), interval 1 year);-- 1 year

3. Date_add ()

Add a time interval to the date, which can only use interval time as a parameter, the usage is the same as adddate ()

Select date_add (now (), interval 1 day);-plus 1 day select date_add (now (), interval 1 hour);-- plus 1 hour select date_add (now (), interval 1 minute);-- plus 1 minute select date_add (now (), interval 1 second);-- plus 1 second select date_add (now (), interval 1 microsecond);-plus 1 millisecond select date_add (now (), interval 1 week) -- 1 week select date_add (now (), interval 1 month);-- 1 month select date_add (now (), interval 1 quarter);-- 1 season select date_add (now (), interval 1 year);-- 1 year

4. Subtime ()

Subtract the specified number of seconds from the date

Select subtime (now (), 1);-minus 1 second

5. Subdate ()

Consistent with the adddate () function, there are two uses. The second parameter is to fill in the number directly, minus the specified number of days for the date, and subtract the specified interval time for the date if you fill in interval.

Select subdate (now (), 1);-minus 1 day select subdate (now (), interval 1 day);-minus 1 day select subdate (now (), interval 1 hour);-minus 1 hour select subdate (now (), interval 1 minute);-minus 1 minute select subdate (now (), interval 1 second);-minus 1 second select subdate (now (), interval 1 microsecond);-minus 1 millisecond select subdate (now (), interval 1 week) -minus 1 week select subdate (now (), interval 1 month);-minus 1 month select subdate (now (), interval 1 quarter);-- minus 1 quarter select subdate (now (), interval 1 year);-- minus 1 year

6. Date_sub ()

Consistent with the date_add () function, subtract a time interval from the date, which can only use interval time as an argument

Select date_sub (now (), interval 1 day);-minus 1 day select date_sub (now (), interval 1 hour);-minus 1 hour select date_sub (now (), interval 1 minute);-minus 1 minute select date_sub (now (), interval 1 second);-minus 1 second select date_sub (now (), interval 1 microsecond);-minus 1 millisecond select date_sub (now (), interval 1 week) -- minus 1 week select date_sub (now (), interval 1 month);-- minus 1 month select date_sub (now (), interval 1 quarter);-- minus 1 season select date_sub (now (), interval 1 year);-- minus 1 year after reading this article on how MySQL implements the date addition and subtraction function, if you think the article is well written, you can share it with more people.

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