[CentOS] System Time - UTC and Local Time

I have installed CentOS on a VM by checking 'System Clock uses UTC' option.
Later I selected CST time zone. Now the date command shows UTC time with
CST timezone:  "Thu Dec  1 04:14:39 CST 2011".  How do I change system
clock to show CST local time? Also, more likely a dumb question but why
isn't date command showing UTC here instead of CST?

jM