[tz] North Vietnam 1970 to 1975 - Asia/Hanoi belongs into main file

Steffen Thorsen thorsen at timeanddate.com
Thu Jul 2 14:35:32 UTC 2020

Thank you for bringing this to our attention (and Paul Eggert for a 
heads up!)

Previously we did map all of Vietnam to the Asia/Ho_Chi_Minh zone, which 
is why Hanoi showed this.

We have now mapped Hanoi and a few other places to Asia/Hanoi instead, 
so we hope it should now be correct.

Locations we show that are Geonames based might still show the wrong 
historical data. We will look into a workaround for that, but it can 
take some time to get corrected.

Best regards,
Steffen Thorsen - timeanddate.com

On 6/30/2020 11:20 AM, Alois Treindl wrote:
> On 29.06.20 06:10, Brian Inglis wrote:
>> Searching for Vietnam time, I see sites stating that Vietnam follows Indochina
>> Time, so this view does not appear too controversial in the region.
>> I agree from the design point of view that countries should have their own
>> independent time zones, as what they do is so unpredictable, and should not be
>> allowed to affect any other country, so allowing a little judicious duplication
>> would be in order, where there is no political commonality but only geographical
>> proximity or coincidence in decision making.
> I noticed also that timeanddate.com represents Hanoi incorrectly for 
> the period 1970-1975.
> See attached screenshot.
> Timeanddate.com is usually a good site for time zone history after 
> 1970, and often goes beyond of what tzdb offers.
> But here they neither included backzone nor the comment which advises 
> to follow Asia/Bangkok for half of Vietnam.
> That problem would easily be fixed if Asia/Hanoi were moved from 
> backzone to file asia. All sites following the main distribution of 
> tzdb would update. Nobody can really be expected to study the 
> comments, to get exect timestamps for after 1970.

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