Sync your computers time with an ntp server
$ apt-get install ntpdate $ crontab -e
Add the following to your crontab,
0 0 * * * ntpdate -b north-america.pool.ntp.org >> /dev/null
You can find other servers here, http://support.ntp.org/bin/view/Servers/NTPPoolServers », or just http://www.ntp.org ».
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