sunclock is a free application for Blackberry storm to set up world Clock. Sunclock is a J2ME Midlet for BlackBerry phones that displays a map of the Earth and indicates the illuminated portion of the globe by drawing sunlit areas dark on light, night areas as light on dark. In addition to providing local time for the default timezone, it also displays up to four additional cities on the map with the local times also. The map updated every minute to follow the movement of the earth.
Using the Setup menu you can choose the cities according to your interest. You can give the DST rules for the chosen city. Blackberry phones do not supports the timezone settings, the localtime will be calculated based on the Main City setup and the internal phone clock will be interpreted as a timezone corrected local time value according to the Main City timezone selection. you can download sunclock app for your BlackBerry storm via OTA link