On 5/9/21 3:41 AM, Michael H Deckers wrote:
+VN +1045+10640 Asia/Bangkok Vietnam (north)
Asia/Hanoi was not added to backward/ as a link, so it seems to be inappropriate to add it to zone.tab.
Asia/Hanoi is different from most of the other cases, as the situation with Hanoi was discovered after the guidelines were changed (so there was no need to add Asia/Hanoi) whereas most of the other cases (e.g., America/St_Thomas) were added before that. For example, had the new guideline been in place earlier, zone.tab would still have its current line "VI +1821-06456 America/Port_of_Spain" even though there would be no America/St_Thomas link in 'backward'. By the way, that "VI +1821-06456 America/Port_of_Spain" is not right; that line should refer to America/Puerto_Rico instead. Port-of-Spain and San Juan, Puerto Rico have agreed since 1970 and the latter is bigger, so America/Port_of_Spain should also be moved to 'backzone'. There are several other examples like that, and we could shrink the installed set of TZif files significantly if this sort of thing were fixed. I plan to take a look into that.
But if it is added, then the coordinates should not be those of Ho Chi Minh City but those of Hanoi: +2102+10551
Thanks, good point, I installed the attached. Although zone.tab is deprecated I imagine some apps are still using it.