It would be good improvement to support fractional time zones in xml skin files.
Now is not possible to show time in "world time skin" for such time zones as:
India, Mumbai or Bombay GMT+5:30;
Darwin, Australia GMT+9:30;
Chatam Island, New Zealand GMT+12:45;
Kabul, Afghanistan GMT+4:30;
Nepal, Kathmandu GMT+5:45;
Tehran, Iran GMT+3:30 and so on.
Moreover, fractional time zone allow to improve greatly accuracy of dynamic world map of day and night zones (Vitrum skin). This last, in fact, is main reason of my post.