[tz] Add new timezone for Hanoi Capital, Vietnam

[Phake Nick]

Tz database does not deal with official timezone name. The time used in
Vietnam being named Hanoi time doesn't make it more Hanoi than Ho Chi Minh
as both should be using the same UTC+7 now. The different was in 1970s. If
your software is expected to show official timezone name used in a region,
then it's supposed to translate Asia/Ho_Chi_Minh into "Hanoi Time"

On 2019-2-18 Mon 14:48, KP <khaiphan9x at gmail.com> wrote:
>So, I mean, +7 is now more standard time with Hanoi than Ho Chi Minh City

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The thing is, the timezone history of Hanoi and Ho Chi Minh look like this:
Hanoi: 1970-2019 UTC+7
Ho Chi Minh: 1970-1975 UTC+8 1975-2019 UTC+7
Bangkok: 1970-2019 UTC+7

Thus you can see the timezone history of Hanoi match the timezone history
of Bangkok from 1970 till now, while it doesn't match for HCM City.

On 2019-2-18 Mon 16:53, Guy Harris <guy at alum.mit.edu> wrote:

> On Feb 17, 2019, at 6:40 PM, Tim Parenti <tim at timtimeonline.com> wrote:
>
> > As was discussed on the original thread in October 2014, pre-unification
> time in Hanoi matches Asia/Bangkok since 1970
>
> By which you presumably mean "from 1970 to 1976", because "pre-unification
> time" ends when North and South Vietnam were reunified in 1976.
>
> > and thus is already considered covered by the database.
>
> If *post*-unification time - which is post-1970 - doesn't match
> Asia/Bangkok, then Asia/Bangkok should not be used for any part of Vietnam;
> there should be one or more Asia/{whatever} for Vietnam from 1970 to the
> present.
>
> If Vietnam's pre-unification offset or rules were different between the
> north and the south from 1970 to 1976, then "one or more" means "at least
> two", e.g. Asia/Hanoi and Asia/Ho_Chi_Minh (even if it was called Saigon in
> 1970).
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