[tz] Add new timezone for Hanoi Capital, Vietnam

KP khaiphan9x at gmail.com
Mon Feb 18 10:21:42 UTC 2019

Thank you from the above friends, so you can see that the +7 time zone of
Hanoi has a longer history and maybe 1 time zone is Asia/Hanoi. If you live
in Vietnam, you will clearly see the difference in time in Hanoi and HCMC,
in the future when Vietnam is more developed, it may be necessary to adjust
the HN and HCMC timezone. Paul Eggert, I know that there must be some rules
for forming time zones. However, I see many exceptions such as Shanghai and
Beijing, there are many other places that I have not mentioned. I think
Hanoi too full of criteria for a time zone, or you can consider it an
exception. Why not?

Vào 16:48, Th 2, 18 thg 2, 2019 Phake Nick <c933103 at gmail.com đã viết:

> 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
> -----
> 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).
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mm.icann.org/pipermail/tz/attachments/20190218/3a9b8021/attachment.htm>

More information about the tz mailing list