[tz] Proposal: validation text file with releases

[Jon Skeet]

In fact, I've only just realized that there's no reason I need to use zdump
here - as the output file format from zic is clearly documented, I can just
consume that directly.
That should make things a lot simpler (from my C#-oriented perspective, of
course - changes to zdump may well still be appropriate...)

Jon


On 19 July 2015 at 06:49, Jon Skeet <skeet at pobox.com> wrote:

> I'd be happy with that behaviour, yes. I don't know how to extract it from
> the current zdump output though (or indeed any transitions before 1900).
>
> Jon
>
>
> On 19 July 2015 at 01:54, Howard Hinnant <howard.hinnant at gmail.com> wrote:
>
>> On Jul 18, 2015, at 6:25 PM, Paul Eggert <eggert at cs.ucla.edu> wrote:
>> >
>> > Jon Skeet wrote:
>> >> In Noda Time, if I don't find a rule leading "into" the  transition
>> period, I take the name of the first rule with no daylight savings.
>> >> zic appears to implement equivalent behaviour
>> >
>> > Yes, that's the intent.
>>
>> I’ve updated my parser with this behavior:
>>
>>
>> https://github.com/HowardHinnant/date/commit/618cd7be060b02a923af60c0eb866a6cbd630a96
>>
>> And here is the updated validation file for 2015e:
>>
>> http://howardhinnant.github.io/tzdata2015e-tzvalidate.txt.zip
>>
>> The only difference I’m now seeing from Jon’s:
>>
>> http://nodatime.org/tzvalidate/tzdata2015e-tzvalidate.zip
>>
>> is associated with years 1904 and prior, which Jon has already explained.
>>
>> Thanks Jon and Paul for the explanation of the lookup rules for when one
>> "falls off the front.”
>>
>> I have one suggestion for the validation file:
>>
>> Some timezones have no transition period and are labeled like so:
>>
>> EST
>> Fixed: -05:00:00 EST
>>
>> My recommendation is to change this to:
>>
>> EST
>> Initially:           -05:00:00 standard EST
>>
>> And furthermore have every timezone do this.  For example:
>>
>> Europe/Amsterdam
>> Initially:           +00:19:32 standard LMT
>> 1834-12-31T23:40:28Z +00:19:32 standard AMT
>> 1916-04-30T23:40:28Z +01:19:32 daylight NST
>> ...
>>
>> instead of:
>>
>> Europe/Amsterdam
>> 1834-12-31T23:40:28Z +00:19:32 standard AMT
>> 1916-04-30T23:40:28Z +01:19:32 daylight NST
>> ...
>>
>> Howard
>>
>>
>
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