d1d7560861
We were mapping "Central America Standard Time" to "CST6CDT", which seems entirely wrong, because according to the Olson timezone database noplace in Central America observes daylight savings time on any regular basis --- and certainly not according to the USA DST rules that are implied by "CST6CDT". (Mexico is an exception, but they can be disregarded since they have a separate timezone name in Windows.) So, map this zone name to plain "CST6", which will provide a fixed UTC offset. As written, this patch will also result in mapping "Central America Daylight Time" to CST6. I considered hacking things so that would still map to CST6CDT, but it seems it would confuse win32tzlist.pl to put those two names in separate entries. Since there's little evidence that any such zone name is used in the wild, much less that CST6CDT would be a good match for it, I'm not too worried about what we do with it. Per complaint from Pratik Chirania.
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