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

Tim Parenti tim at timtimeonline.com
Fri Oct 3 15:14:31 UTC 2014

As it stands right now, the suggested new zone from Trần Ngọc Quân does not
differ from Asia/Ho_Chi_Minh after 1970 and should not be added, per the
Theory document, as Robert Elz alluded to.  Whether a city is a capital or
official legal basis for a time zone should not affect our nomenclature.

On 3 October 2014 06:39, Alan Barrett <apb at cequrux.com> wrote:

> The Wikipedia page, <https://en.wikipedia.org/wiki/Time_in_Vietnam>, says
> that they were different.

I would note that that page only had one author and does not cite any
sources relevant to the data it presents.  The second and fourth sources
provided in the proposed patch (in Vietnamese) don't seem to support its
data; however, the third reference provided,
http://www.thoigian.com.vn/?mPage=P80D01, seems somewhat promising,
although I don't think it provides nearly as much specificity as the
proposed patch.

For example, from 1968 to 1975, North Vietnam (Hanoi) was on UTC+07:00, and
> from 1960 to 1975, South Vietnam (Saigon, or Ho Chi Minh City) was on
> UTC+08:00.

If this is true, then Asia/Ho_Chi_Minh needs to be updated, in which case a
new zone for North Vietnam is *indeed* needed to accurately reflect the
pre-unification differences.  Per Theory, this zone would probably be
called Asia/Hanoi as "Hanoi" is more common in English than "Ha Noi".

Tim Parenti
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