Scenario: How to force syncronize NTP to the NTP server.
System: RHEL 6/ CentOS 6

Steps:
1. Stop the ntpd service :
# service ntpd stop

2. Force to sync
# ntpd -gq
-g = requests an update irrespective of the time offset
-q = requests the daemon to quit after updating the date from the ntp server.

3. Start the ntpd service :
# service ntpd start
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