server time off, due to hardware clock out of sync

On reboot the server time can be out of sync, because hard clock is out of sync.

This can be checked by running”hwclock; date” and comparing the results.


In Red Hat 6, the ntpdate start-up script is is separate from the ntpd start-up script and not enable by default.


ntpd does not sync time immediately, where ntpdate does a one time sync of the server clock to the ntp server.
To enable ntpdate on Red Hat 6 run “chkconfig ntpdate on”.


To sync the hardware clock with the system clock run “hwclock –systohc”.