Feb 122010
Immediate time synchronization in RHEL/CentOS/Fedora
Answer:
If you want to sync the system time without installing ntpd package, rdate is an older way but it will do what you need.
# rdate -s ntp0.cornell.edu
You can find a list of time servers at: http://pank.org/blog/2004/08/time-server-list.html