Recently our Rackspace Cloud servers and Amazon EC2 instances both running CentOS were rebooted after updating the glibc package which caused each server's timezone to revert back to UTC.. After making both of these changes be sure to reboot your server and then use the date command to check that your server is still in your local timezone rather than UTC.. Being based in Perth GMT +8 I have always thought it made sense to have our servers running in the Australia Perth timezone rather than UTC.. In addition to the symlink it is also necessary to edit the etc sysconfig clock file and change it to your local timezone in my case ZONE=. Australia Perth... This makes sense for many reasons mostly that when we set up a cron job we can use local time rather than UTC which makes life very easy..
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