[tz] Reason for removal of several TZ abbreviations

Ken Murchison murch at fastmail.com
Wed Dec 6 18:11:19 UTC 2017

On 12/06/2017 12:58 PM, Guy Harris wrote:
> On Dec 6, 2017, at 8:50 AM, Brian Inglis <Brian.Inglis at systematicsw.ab.ca> wrote:
>> On 2017-12-05 14:29, Guy Harris wrote:
>>> So, for doing a script to do the equivalent of what macOS and iOS do, you'd
>>> want more like "get your external IP address, geolocate it, and hand it to a
>>> program with a set of shapefiles for tzdb regions". See, for example
>>> 	https://github.com/evansiroky/timezone-boundary-builder
>>> (to which
>>> 	http://efele.net/maps/tz/world/
>>> now refers people).
>> More likely query the underlying geodatabase for the time zone region, often
>> indexed by the minimum bounding rectangle [min x, min y[ - [max x, max y]
>> surrounding the possibly non-convex hull, then resolve muiltiple hits by
>> checking the interior convex polygons contain the coordinate, or equivalent tests.
> That's what I meant by "hand it to a program with a set of shapefiles for tzdb regions".

Like so (a request against my local TZdist server with the geolocate 
extension and using the Siroky boundaries):

GET /tzdist/zones?location=geo:32.16,-109.13,0 HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (X11; Fedora; Linux x86_64; rv:57.0) 
Gecko/20100101 Firefox/57.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive

HTTP/1.1 200 OK
Date: Wed, 06 Dec 2017 18:06:10 GMT
Cache-Control: must-revalidate, max-age=86400
Expires: Thu, 07 Dec 2017 18:06:10 GMT
Vary: Accept-Encoding
Accept-Ranges: bytes
ETag: "890939292-1466089793"
Last-Modified: Thu, 16 Jun 2016 15:09:53 GMT
Content-Type: application/json; charset=utf-8
Content-MD5: f9xV70dO60dwRS+ukiKkPQ==
Content-Length: 311

   "synctoken": "890939292-1466089793",
   "timezones": [
       "tzid": "America/Phoenix",
       "etag": "3297940-1466089793",
       "last-modified": "2016-06-16T15:09:53Z",
       "publisher": "IANA Time Zone Database",
       "version": "2016e",
       "aliases": [

Kenneth Murchison
Cyrus Development Team
FastMail Pty Ltd

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