To get the correct time on your linux machine, try ntpdate command:
sudo ntpdate ntp.nasa.gov
A list of ntp servers on the internet:
| server adress | Location |
|---|---|
| ntp.ipv6.viagenie.qc.ca | IPV6 ONLY |
| clock.via.net | |
| server fartein.ifi.uio.no | Norway |
| server ntp.uio.no | Norway |
| server ntp.eunet.no | Norway |
| ntp.demon.co.uk | UK |
| ntp.nasa.gov | USA |
| bigben.cac.washington.edu | USA |
| time-b.nist.gov | USA |
| montpelier.ilan.caltech.edu | USA |
| nist1.aol-ca.truetime.com | USA |
| nist1.datum.com | USA |
| time-a.timefreq.bldrdoc.gov | USA |
| time-b.timefreq.bldrdoc.gov | USA |
| time-c.timefreq.bldrdoc.gov | USA |
| time.nist.gov | USA |
| utcnist.colorado.edu | USA |
| tick.usno.navy.mil | USA |
| tock.usno.navy.mil | USA |
| mizbeaver.udel.edu | USA |
You might want to setup this command as a daily cron job to adjust it if it tends to drift often.
Reference: http://linuxreviews.org/howtos/ntp/
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