[tz] isstd and isgmt effect

[Jason]

Ok, just to make sure I'm clear: file format is basically a header, followed by the transition times, followed by ttinfo offsets, followed by ttinfo structures, followed by these two sets flags. So your understanding is that those two sets of flags are only for parsing dates and have nothing to do with interpreting the transition times? That would explain what the person on stack overflow saw and fits better with what the man page says (though the man page is still confusing). 

Then I'll parse the files under this understanding. Thanks for your help. 

Sent from my iPhone

> On Sep 27, 2015, at 9:55 AM, Paul Eggert <eggert at cs.ucla.edu> wrote:
> 
> 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.