Installing ntp (time setup) 2017
ntp is the time daemon. Servers don't like not to be in sync. Configure it with yast, time and date module, it's very simple to use any ntp server yast is proposing, but if you get a public pool in your area, it's better. YaST should be able to find it for you (in France, it does). Don't forget to activate the ntp service, better do it with YaST.