How to change the timezone in linux

From http://www.thegeekstuff.com/2010/09/change-timezone-in-linux/

Delete (or perhaps better, rename) the current localtime file in etc.

# cd /etc
# rm localtime

Create a link to the preferred time

# cd /etc
# ln -s /usr/share/zoneinfo/Australia/Sydney localtime

The system will see the time change immediately.

Services like mysql will need a restart to pick it up