If you are talking about the “hci” user’s environment and not the entire system’s timezone, then you can set the timezone via:
–> setting to EST as an example
(csh) setenv TZ EST
(bsh/bash) TZ=EST;export TZ
(ksh) export TZ=EST
certainly you can set these in the user’s login profile files such as .profile, .login, etc
hope this helps 🙂