That's not correct...
SH3 is highly accurate in regard to time zone changes and as accurate as a virtual "flat" world can be regarding the changes in sunrise/sunset at high latitudes. As Sailor Steve pointed out, the clock keeps "Z" (Greenwich Mean Time) and displays local time when you roll the cursor over it. Since all Log entries are made in GMT, I keep my hand-written "Rough Log" in GMT also.
World time zones are centered on principal meridians at 15 degree multiples east and west of the Prime Meridian; they start and stop at 7.5 degrees east and west of their respective principal meridians.
Deviations from that scheme exist almost everywhere due to political boundaries and cultural differences, but to a real mariner/navigator, those deviations mean nothing until you enter or leave port. At sea, a real navigator (not the putz with only a GPS for a tool-set) goes strictly by the longitude difference from Greenwich. That's why accurate celestial navigation was not possible until good chronometers were available; you can easily determine how far E/W you are from the Prime Meridian by comparing Local Apparent Noon with a clock keeping Zulu time.
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