Yeah, there's no reason you can't put multiple entries into one item name.
There are a few awkward 1/2 hour time zones, and even one 3/4 hour timezone that I know of. Not much of a problem; 5.5 or 13.75 hours would work. It would also mean that you could show the GMT offset in the output - although you could do that with my version by dividing by 3600. Swings and roundabouts...
I just wanted to make the code as obvious as possible (and multiplying by 3600 isn't necessarily that obvious to some people
