adding 30 minutes to datetime php mysql

Question

I have a datetime field  endTime  in mysql  I use gmdate   to populate this endTime field   The value stored is something like 2009-09-17 04 10 48    I want to add 30 minutes to this endtime and compare it with current time  ie  the user is allowed to do a certain task only 30 minutes within his endTime  After 30 minutes of his endTime  i should not allow him to do a task   how can i do that in php   i m using gmdate to make sure there are no zone differences   Thanks in advance

User · Answer

Dominc has the right idea  but put the calculation on the other side of the expression   SELECT   FROM my table WHERE endTime  lt  DATE SUB CONVERT TZ NOW      global time zone   GMT    INTERVAL 30 MINUTE    This has the advantage that you re doing the 30 minute calculation once instead of on every row  That also means MySQL can use the index on that column  Both of thse give you a speedup

User · Answer

If you are using MySQL you can do it like this    SELECT  2008-12-31 23 59 59    INTERVAL 30 MINUTE     For a pure PHP solution use strtotime  strtotime    30 minute   yourdate

User · Answer

Try this one  DATE ADD datefield  INTERVAL 30 MINUTE

User · Answer

MySQL has a function called ADDTIME for adding two times together - so you can do the whole thing in MySQL  provided you re using    MySQL 4 1 3    Something like  untested    SELECT   FROM my table WHERE ADDTIME endTime    0 30 00    lt  CONVERT TZ NOW      global time zone   GMT

User · Answer

Use DATE ADD function   DATE ADD datecolumn  INTERVAL 30 MINUTE

[php] adding 30 minutes to datetime php/mysql

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