[SOLVED] Can MySQL convert a stored UTC time to local timezone?

Can MySQL convert a stored UTC time to local timezone?

Can MySQL convert a stored UTC time to local time-zoned time directly in a normal select statement?

Let's say you have some data with a timestamp (UTC).

CREATE TABLE `SomeDateTable` (
  `id`    int(11) NOT NULL auto_increment,
  `value` float NOT NULL default '0',
  `date`  datetime NOT NULL default '0000-00-00 00:00:00',
  PRIMARY KEY  (`id`)
)

Then when I

"select value, date from SomeDateTable";

I of course get all the dates as in their stored UTC form.

But let's say that I would like to have them in another timezone (with DST), can I then add some magic to the select query so that I get all the dates back in the selected timezone?

"select value, TIMEZONE(date, "Europe/Berlin") from SomeDateTable";

Or must I do this in some other layer on top, like in some php code? (it seems to be how most people have solved this problem).

If your MySQL installation allows you to use CONVERT_TZ it is a very clean solution, this example shows how to use it.

SELECT CONVERT_TZ( '2010-01-01 12:00', 'UTC', 'Europe/Stockholm' )

However I don't know if this is a good way since some MySQL installation is missing this function, use with care.

Solution

Yup, there's the convert_tz function.