[tz] Incorrect Time Zone Data for American/Grand_Turk

Robert MacGrogan rmacgrogan at flightbridge.com
Thu Aug 2 18:28:38 UTC 2018

Thanks for your help. I'll see if I can take this up with the Ak Zone Info


On Thu, Aug 2, 2018 at 2:11 PM, Paul Eggert <eggert at cs.ucla.edu> wrote:

> On 08/02/2018 09:23 AM, Robert MacGrogan wrote:
>> Running my own unit tests, btw, that is not the output I get. For Sun Mar
>> 11 07:00:00 2018 UT using the 2018e data I get Sun Mar 11 02:00:00 2018 as
>> the local Grand Turk time. So maybe it is a code issue. If I change line
>> 3426 in the northamerica file to this:
>> -4:00USAST2018 Mar 11 3:00
> Yes, it sounds like a code issue on your end. That change to the data is
> definitely wrong, as it would cause America/Grand_Turk to observe DST in
> 2016 and 2017 (which is ahistorical) and would always abbreviate the time
> as "AST" even when it was Atlantic Daylight Time.
> My guess is that your code is getting confused by the "2018 Mar 11 3:00",
> and is incorrectly interpreting that timestamp as being EST instead of AST.
> As I recall, zic itself had problems in this area, long ago.


Rob MacGrogan | Director of Software Development
rmacgrogan at flightbridge.com  <rmacgrogan at flightbridge.com>

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FlightBridge, Inc.
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