[tz] North Vietnam 1970 to 1975 - Asia/Hanoi belongs into main file

Paul Eggert eggert at cs.ucla.edu
Mon Jun 29 00:42:49 UTC 2020

On 6/28/20 4:17 PM, pierreneter wrote:
> if Asia/Bangkok represents areas with a time zone
> of +7, then why was Asia/Ho_Chi_Minh created?

Among other things Asia/Ho_Chi_Minh differs from Asia/Bangkok for timestamps
from 1959 to 1975, when south Vietnam was at +08 while the rest of the region
was at +07. tzdb identifies timezones where clocks have agreed since 1970, and
since these regions disagreed from 1970 to 1975 they need distinct identifiers.
For more, see <https://data.iana.org/time-zones/theory.html#naming>.

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