[tz] Proposal: validation text file with releases

Howard Hinnant howard.hinnant at gmail.com
Sat Jul 18 22:01:54 UTC 2015

On Jul 18, 2015, at 3:40 PM, Jon Skeet <skeet at pobox.com> wrote:
> Next update: I've improved the zdump-based generation of the data, and put the data in the current format for all the tz data releases I can find (from 1996 onwards) at http://nodatime.org/tzvalidate/

I’ve generated a version of tzdata2015e-tzvalidate.txt.zip from my code here:


There are appear to be two kinds of differences:

1.  I appear to start earlier than you, for example I have:

1891-03-14T23:48:48Z +00:09:21 standard PMT

and you do not.

2.  This one has me more concerned:  When a zone specifies a rule/date combination and the date falls of the beginning of the rule table, I assume a “” variable part, where you appear to assume a “S” variable part.  For example, I have:

1924-01-01T03:58:29Z -03:58:29 standard BMT
1932-01-01T03:58:29Z -04:00:00 standard AT
1977-06-12T06:00:00Z -03:00:00 daylight ADT

And you have:

1924-01-01T03:58:29Z -03:58:29 standard BMT
1932-01-01T03:58:29Z -04:00:00 standard AST
1977-06-12T06:00:00Z -03:00:00 daylight ADT

The America/Barbados Zone switches to the Barb Rule on 1932-01-01T03:58:29Z, using the format A%sT.  But the first Barb Rule is 1977-06-12 2:00.  I looked for documentation for what is supposed to happen in a situation like this, but didn’t find anything.


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