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
Author: bpeh
Bernard Peh is a great passioner of web technologies and one of the co-founder of Sitecritic.net Website Design and Reviews. He works with experienced web designers and developers everyday, developing and designing commercial websites. He specialises mainly in SEO and PHP programming.
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No need to stop ntpd service, just use ntpdate -u 0.rhel.pool.ntp.org
Cheers.