Now it appear to works correctly. [=D>]
I think this could be the final 1.1.
One more suggestion (but not mandatory):
When click OK -> close (exit) the application.

You've made a very good job!

PS (also not mandatory)
You could put cityCoordinates and timeZoneOffsets in two text files and loaded from there.
In this way the main program will be more easy to read.