System settings timezone change

Hi again,
As you know once System Time zone set at begining, it can’t be changed (at least I read comments like that)
However with Propert Letter I can change Timezone field (Read Only section) at System settings

Shared this topic for 2 reason:

  1. Tested this on my test account. Want to be sure will not be any problem my real server ?
  2. If everythink okey whoever suffer from this timezone problem could be a solution to them.