This is sort of like a follow up on my DST patch post

How do I change the timezone on my Solaris server/workstation?

Solution

a) Edit /etc/TIMEZONE
NOTE: the man page incorrectly states this file is called /etc/timezone
b) Reboot your server with shutdown or init.

Examples
——–
US/Eastern
US/Central
US/Mountain
US/Pacific

For the full list, look in:
/usr/share/lib/zoneinfo/