Using GeekTool to display key timezones

I’m usingĀ GeekTool to display some key time zones on my wallpaper, which happens to include world map.
Desktop with Geeklets to show time zone info
The key to this is to add Shell Geeklets using a command similar to this:

env TZ=Pacific/Auckland date +'%l:%M %p %A'

Use the appropriate timezone code and the date string formatting codes to display the time and date the way you want.