[tz] [PATCH] tzdata: Asia/Ha_Noi: Add new timezone

Trần Ngọc Quân vnwildman at gmail.com
Sun Oct 5 08:42:24 UTC 2014

On 05/10/2014 10:22, Paul Eggert wrote:
> Trần Ngọc Quân wrote:
>> I find an other book about this topic:
> Yes, there are a lot of books on Vietnamese dates and times!  All in
> Vietnamese, unfortunately for me.  The book by Trần Ngọc Quân appears
> to be one of the most authoritative.  Dershowitz and Reingold cites
> its 2005 edition in their book Calendrical Calculations (3rd ed.)
> <http://emr.cs.iit.edu/home/reingold/calendar-book/third-edition/>. 
> They also cite the 2000 edition of a calendrical book by L T Lân
Dr. Lê thành Lân
I find his email, but it I'm not sure he still use it. But I will try to
lethanhlan at yahoo.de <mailto:lethanhlan at yahoo.de>
> and personal communications from Hồ Ngọc Đức -- none of which agree
> exactly, unfortunately.
I will try to contact Hồ Ngọc Đức.
> > This is Hanoi, not Ho Chi Minh City.
> We need to correct the Asia/Ho_Chi_Minh entry regardless of what we do
> about Hanoi, and that is what the patch does.  As I pointed out in my
> most recent email, it appears to be unnecessary to add an entry for
> Hanoi, since Hanoi does not have a unique time zone history since
> 1970.  In contrast, Ho Chi Minh City (now that its data are corrected)
> does have a unique time zone history since 1970 and therefore needs a
> distinct Zone.
> I had planned to replace the Ho Chi Minh City zone with a link on the
> grounds that it was redundant, but this new information means we need
> to keep it.
I find other document about time zone in Vietnam (an archive on
website). Note: date format is dd/mm/yyyy. It is  translated by google
with some fix:

Previously,withthenationalstageorapart ofthe countryusingdifferent time

- From01/01/1943:Vietnamaccording toGMT +8(1hourearlierthannormal).
-From01/04/1945:VietnamGMT+9,2 hoursearlierthanstandard time.
-From01/04/1947,theFrench colonialistsoccupiedGMT+8.
-In the South,from01/07/1955accordingto GMT+7.To01/01/1960,thetime
-In the north,according toDecision No.121/CPsigned on08/08/1967byCouncil
ofGovernment,from08/08/1967accordingto GMT+7.
-From02/08/1976,the countrystandardtime zoneGMT+7.

We seem have to find more document for both Vietnam and Lao, Cambodia. I
hope I reply soon.

Trần Ngọc Quân.

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