1. su to root
2. Find your timezone file under /usr/share/zoneinfo. For example:
   
   /usr/share/zoneinfo/Asia/Bangkok
3. OPTIONAL: backup the current timezone configuration:
   
   cp /etc/localtime /etc/localtime.bak
4. Create a symbolic link from the appropiate timezone to /etc/localtime.
   
   ln -sf /usr/share/zoneinfo/Asia/Bangkok /etc/localtime
5. Use rdate or ntpdate to set the system time (ntpdate is better):
   
   /usr/sbin/ntpdate time.nist.gov
   
   or
   
   /usr/bin/rdate time.nist.gov
6. Set the hardware clock to the system time:
   
   /sbin/hwclock –systohc

Note: you may install ntp via yum if ntpdate does not exists on your system.

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Tags: datetime ntpdate linux