Debian: Sync time and date with external servers


Warning: Use of undefined constant user_level - assumed 'user_level' (this will throw an Error in a future version of PHP) in /homepages/3/d98111892/htdocs/insanelabs/htdocs/wp-content/plugins/ultimate-google-analytics/ultimate_ga.php on line 524

Install ntpdate:
aptitude install ntpdate

To update manually:
ntpdate <time server> (ntpdate pool.ntp.org or ntpdate time.nist.gov)

Create a cron job to have your server sync at intervals you like.