Hi!
Hopefully the data base is suffient clever.
There are really strange things in the time zone DB :
Kiribati and Hawaii are around at the same longitude.
Hawaii is UTC -10 h
Kiribati is UTC + 14 h
Yes! Kiribati is allways 24 h ahead of Hawaii!
And the half-hour-zones getting less but are still present in a lot of coutries like India, Iran, Australia
And don't look for logic . The Central European Time is in reality the area of 3 zones from western Spain to eastern Poland.
Winni