This is a simple tip to keep your Linux box’s clock up-to-date (quite literally). Using your ntpdate program, set a cron for say 30 minutes to sync your time with a NTP server.
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30 * * * * /usr/sbin/ntpdate -s ntp-2.mcs.anl.gov
The above server is available to US machines, and requires an email notification for usage as do most. Click here for a more complete list of NTP servers.

