On Feb 18, 2019, at 10:07 AM, KP <khaiphan9x@gmail.com> wrote:
I have a talent for continuous change of Indochina time, but it is a Vietnamese document, I have not found the same document in English. Show that the time of Vietnam taking Asia/Bangkok is wrong, because Thai does not apply under this document https://vi.m.wikipedia.org/wiki/Giờ_ở_Việt_Nam
See https://translate.google.com/translate?sl=auto&tl=en&u=https%3A%2F%2Fvi.wikipedia.org%2Fwiki%2FGiờ_ở_Việt_Nam for the Google translation into English. What it says about post-1970-01-01 00:00:00 UTC times is: Time in Northern Vietnam ... January 1, 1968 - June 12, 1975 UTC + 07:00:00 Hanoi time zone Time in South Vietnam ... January 1, 1960 - June 12, 1975 UTC + 8:00 pm Saigon Standard Time The time in Vietnam is unified June 13, 1975 -nay UTC + 07:00:00 Standard time zone with no indication about standard vs. summer time; the tzdb doesn't show Vietnam ever having seasonal time shifts, so that makes sense. The only reference given on the page doesn't seem to, in the generated translation, address time zones at all. And, no, it says nothing about Thailand, but, as noted, North Vietnam happened to keep the same time as Thailand from 1970 to reunification; *that's*, plus Bangkok being larger than Hanoi, why Asia/Bangkok is used as the tzdb id for that region.