Well, you are right. It's a bug in the underlying data.
grin As I write this it is 13.09 GMT (UTC+5), which means it is 22.09 in Perth (UTC+13), same day. So the dropdownlist provides wrong choices, because UTC-11 to UTC-7 are not correct, as they belong to the same day as UTC+-0 and not the previous.
Why the heck does anyone in this world would chose not to use GMT+-x?
Have a nice day
All decision is left to your taste
Update

GMT-12 UTC-7
GMT-11 UTC-6
GMT-10 UTC-5
GMT-9  UTC-4
GMT-8  UTC-3
GMT-7  UTC-2
GMT-6  UTC-1
GMT-5  UTC
GMT-4  UTC+1
GMT-3  UTC+2
GMT-2  UTC+3
GMT-1  UTC+4
GMT    UTC+5
GMT+1  UTC+6
GMT+2  UTC+7
GMT+3  UTC+8
GMT+4  UTC+9
GMT+5  UTC+10
GMT+6  UTC+11
GMT+7  UTC+12
GMT+8  UTC-11
GMT+9  UTC-10
GMT+10 UTC-9
GMT+11 UTC-8
GMT+12 UTC-7

Or did I just mix that up cause of our daylight saving stime? no?

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