This morning I noticed that my ucs domain server have wrong time 2 minutes off. What is the correct way of changeing it?
Use NTP to automatically and continuously set the time from Internet time servers.
You can set up one to three timeservers. Use those nearest to your geological location:
ucr set timeserver=de.pool.ntp.org timeserver2=asia.pool.ntp.org timeserver3=us.pool.ntp.org
invoke-rc.d ntp restart
Do this on all of your servers, or at least one and use this one as the NTP server for the others.