[tz] isstd and isgmt effect

Paul Eggert eggert at cs.ucla.edu
Sun Sep 27 07:55:56 UTC 2015

If I understand your question, you don't need to worry about those flags, as 
they're used only when decoding incompletely-specified TZ-style strings which is 
not your problem.  Admittedly I am not an expert in this area.

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