MySQL timezone change?

The easiest way to do this, as noted by Umar is, for example

mysql> SET GLOBAL time_zone = 'America/New_York';

Using the named timezone is important for timezone that has a daylights saving adjustment. However, for some linux builds you may get the following response:

#1298 - Unknown or incorrect time zone

If you're seeing this, you may need to run a tzinfo_to_sql translation... it's easy to do, but not obvious. From the linux command line type in:

mysql_tzinfo_to_sql /usr/share/zoneinfo/|mysql -u root mysql -p

Provide your root password (MySQL root, not Linux root) and it will load any definitions in your zoneinfo into mysql. You can then go back and run your

mysql> SET GLOBAL time_zone = timezone;

issue the command:

SET time_zone = 'America/New_York';

(Or whatever time zone GMT+1 is.: http://www.php.net/manual/en/timezones.php)

This is the command to set the MySQL timezone for an individual client, assuming that your clients are spread accross multiple time zones.

This command should be executed before every SQL command involving dates. If your queries go thru a class, then this is easy to implement.

While Bryon's answer is helpful, I'd just add that his link is for PHP timezone names, which are not the same as MySQL timezone names.

If you want to set your timezone for an individual session to GMT+1 (UTC+1 to be precise) just use the string '+01:00' in that command. I.e.:

SET time_zone = '+01:00';

To see what timezone your MySQL session is using, just execute this:

SELECT @@global.time_zone, @@session.time_zone;

This is a great reference with more details: MySQL 5.5 Reference on Time Zones

Here is how to synchronize PHP (>=5.3) and MySQL timezones per session and user settings. Put this where it runs when you need set and synchronized timezones.

date_default_timezone_set($my_timezone);
$n = new \DateTime();
$h = $n->getOffset()/3600;
$i = 60*($h-floor($h));
$offset = sprintf('%+d:%02d', $h, $i);
$this->db->query("SET time_zone='$offset'");

Where $my_timezone is one in the list of PHP timezones: http://www.php.net/manual/en/timezones.php

The PHP timezone has to be converted into the hour and minute offset for MySQL. That's what lines 1-4 do.

If you have the SUPER privilege, you can set the global server time zone value at runtime with this statement:

mysql> SET GLOBAL time_zone = timezone;