To change the timezone:
[root@voyager asterisk-188.8.131.52]# date
Sat Nov 17 06:12:49 MSK 2012
[root@voyager etc]# ln -sf /usr/share/zoneinfo/EST /etc/localtime
[root@voyager etc]# dateMake sure to restart your VPS and also check the syslog daemon that it has its time properly. I noticed I had to restart the syslog daemon service to get the date and time updated.
Fri Nov 16 22:13:52 EST 2012
service syslog restart