[tz] isdst bug Europe/Dublin (tzdb-2019c)

[Robert Elz]

    Date:        Sat, 14 Dec 2019 19:56:42 -0500
    From:        scs at eskimo.com (Steve Summit)
    Message-ID:  <2019Dec14.1956.scs.0008 at quinine2.home>

  | [But perhaps what you're saying is that redefining time_t as UT1
  | is part of "What we really need to do".]

First, part ofmy belief is that nothing that POSIX (or the C std)
has related to time is even close to adequate.

For time_t what I mean is that it should not survive as it is, we need
(just for "seconds" time counters) two entirely different things,  which
keep track of the different ways we count time, differently.  Currently
this is fudged with how one obtains the time_t (CLOCK_MONOTONIC, CLOCK_REALTIME
etc) but because they all produce the same type (time_t) they can all
be processed the same way - so a CLOCK_MONOTONIC result can be handed to 
localtime() which makes no rational sense at all.

kre