Yes, hiryuu said it.
I'm not sure if it's standard with RedHat or not, but all the Linux boxes I use get ntpdate installed.
ntpdate allows you to sync clocks with known-accurate* time sources. You esentially just run "ntpdate server.dom" -- http://www.eecis.udel.edu/~mills/ntp/servers.html
has a list of servers. (If you don't have ntpdate, you can grab it from rpmfind.net.) I'd highly recommend it.
* In theory. I've run ntpdate consecutively with different hosts and been off by about 45 minutes. This shouldn't happen, as it's usually precise to a fraction of a second; I think one of the clocks was just totally whacked.