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Install and Configure

date

aptitude install ntp
aptitude install ntpdate

Troubleshooting

No association ID's returned

dpkg-reconfigure ntp

ntpq -p

     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
 ntp.pbx.org     xx.xxx.xxx.xxx   2 u    -   64    1   33.763  1799619   1.054
 xray.metadom.co xx.xxx.xxx.xxx   2 u    1   64    1   40.367  1799619   0.001
 hydrogen.cert.u xx.xxx.xxx.xxx   2 u    -   64    1   64.740  1799619   0.001
 mirror          .INIT.          16 u    -   64    0    0.000    0.000   0.001

Add your time server

/etc/init.d/ntp-server stop
ntpdate clock.fmt.he.net
ntpdate ntp1.tummy.com
/etc/init.d/ntp-server start

Using The Cron

To configure the system to synchronize the clock with an Internet Time Server every morning, add the following entry to the /etc/crontab configuration file:

#m h dom mon dow user  command
57 5 *   *   *  root   /usr/sbin/ntpdate-debian > /dev/null

Public Internet Time Servers