With Debian I use the crontab:
Code:
 40      10,15,20        * * *   /usr/sbin/ntpdate -v de.pool.ntp.org; /sbin/hwclock -u --systohc
I've read Sysadmin time again and now found this hint:
At least from Debian version 2.2 onwards, the system automatically saves the system time to hardware clock on shutdown, and sets the system clock from hardware clock when Debian boots up. This is done in the script /etc/init.d/hwclock.sh.
Therefore I changed my crontab-entry within Debian to
Code:
 40      10,15,20        * * *   /usr/sbin/ntpdate -v de.pool.ntp.org