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A general description is here.
Where time zones have changed abbreviations over the years, the software tries to more consistently use the current abbreviation. On some platforms where the C function ‘localtime’ changed the ‘tzname’ variables the reported abbreviation could have been that of the last time converted.
plotting symbol ‘pch=14’ had the triangle upside down on some devices (typically screen devices). The triangle is supposed to be point up. Reported by Bill Venables.
Where time zones have changed abbreviations over the years, the
software tries to more consistently use the current abbreviation. On
some platforms where the C function ‘localtime’ changed the ‘tzname’
variables the reported abbreviation could have been that of the last
time converted.