if there is a need to synchronise the system clock manually, it can be a straight forward thing

service ntpd stop
ntpdate 0.rhel.pool.ntp.org
service ntpd start

some of the files of interest:

/etc/sysconfig/clock
/usr/share/zoneinfo
Share and Enjoy:
  • Digg
  • del.icio.us
  • Facebook
  • Google Bookmarks
  • StumbleUpon
  • Technorati
  • LinkedIn
  • MySpace
  • Slashdot
  • TwitThis
  • Yahoo! Buzz