[tz] tzdata isstd question

[Random832]

On Thu, Oct 29, 2015, at 16:14, Paul Eggert wrote:
> Sorry, I must be missing something, but I am not following the question. 
> For that absolute transition, there's no difference between 02:00 
> standard time, 03:00 local time, and 08:00 UTC; they're all the same 
> thing, and the "s" in "2:00s" is purely for convenience in the source
> data.

The binary data does include information about the difference for the
purpose of determining how the transition should be treated if the
timezone is transposed to a different offset due to being used as the
basis for interpreting POSIX rules.

This data is in the sections which tzh_ttisgmtcnt/tzh_ttisstdcnt
determines the size of.