raspi: time via ntp

the ntpserver is just a waist of memory for a raspi and its enough to synchro the time every couple hours.

follow this:

1. right time zone:
   [code]$ sudo dpkg-reconfigure tzdata
   [/code]
2. deinstall ntp server:
   [code]$ sudo apt-get purge ntp
   [/code]
3. install ntpdate:
   [code]$ sudo apt install ntpdate
   [/code]
4. add cron entry:
   [code]$ sudo crontab -e
   @reboot ntpdate -s 0.de.pool.ntp.org
   0 */6 * * * ntpdate -s 0.de.pool.ntp.org
   [/code]

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source: from german page aufschnur.de