It is possible to link Hanoi to Asia/Ho_Chi_Minh instead of Asia/Bangkok as the logic you say will be better. The above-mentioned criteria seem to be ignored, although it is quite reasonable. North Vietnam uses time zones imposed, there is no document saying that North Vietnam accepted Asia/Bangkok as a representative time zone. However, I did not change the idea that Hanoi is the best representative for Vietnam, although I do not have the right to change anything. Vào 23:52, Th 2, 18 thg 2, 2019 Tim Parenti <tim@timtimeonline.com đã viết:
On Mon, 18 Feb 2019 at 11:37, KP <khaiphan9x@gmail.com> wrote:
Countries including Cambodia, Laos and South Vietnam (regardless of agreement) have their own time zones, except North Vietnam. Is it an omission or bias?
Not really. Cambodia and Laos are linked to Asia/Bangkok as well:
# Thailand # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone Asia/Bangkok 6:42:04 - LMT 1880 6:42:04 - BMT 1920 Apr # Bangkok Mean Time 7:00 - +07 Link Asia/Bangkok Asia/Phnom_Penh # Cambodia Link Asia/Bangkok Asia/Vientiane # Laos
That said, it does look like Asia/Hanoi (which currently exists in the backzone file) should indeed be linked here as well for the same reasons, since Asia/Ho_Chi_Minh does differ from these from 1970 to 1975. It would appear that was an oversight due to the various complexities.
Commentary should also be added in the Vietnam section of the file, if the link isn't added there. Or perhaps this is indeed a complex enough case to warrant bringing Asia/Hanoi out of backzone. Either way, the name should be in the main distribution somewhere, since Asia/Ho_Chi_Minh is not representative of Vietnam alone.
On Mon, 18 Feb 2019 at 10:13, Clive D.W. Feather <clive@davros.org> wrote:
Hmm, do we need another zone for that? Or will there be a string of such zones as the border moved south? I don't know the history of Vietnam well enough to know.
I should hope that in post-1970 cases of incremental territorial shifts, we can treat this a bit like we treat Asia/Urumqi: The geographical boundaries are/were fluid/undefined, and you simply choose the file that adheres to whichever timescale is most appropriate for your situation. The line between limiting ourselves to the two "major" zones and creating a new zone for each city as it was captured may be fuzzy, but I'm pretty confident that line exists somewhere in there.
-- Tim Parenti