[tz] tzfiles contain Unix epoch for the first transition time

[Robert Elz]

    Date:        Thu, 13 Aug 2015 16:21:47 +0000
    From:        Eric Erhardt <Eric.Erhardt at microsoft.com>
    Message-ID:  <CY1PR0301MB1530174F8E3E98052AD684708E7D0 at CY1PR0301MB1530.namprd03.prod.outlook.com>

  | I've hit a snag with the latest tzdata 2015f.

Aside from what Jon Skeet asked, you should also indicate what you used
to generate the tz binary files (tzdata only has the source for the info,
not the binary versions you're obviously looking at - and quite properly
I think.)  Was it the zic that is with the 2015f sources, or did you use
some other version, and if so what?  What platform was that running on?

  | This causes the TimeZoneInfo parsing code to throw an exception because it
  | is assuming these transitions are sorted in ascending order.

That's reasonable, they should be.

  | Is this an intentional change in the tzfiles?

No, what you're seeing is definitely a bug.  The issue is how that
happened.

kre