Dear Tzdata Maintainers,

Is it historically appeared in Asia, that several Locations have Offset only instead of Time Zone Abbreviation?

I mean next location:

Bangkok from Thailand which is related with Vientiane from Laos and Phnom Penh from Cambodia – all of them is in Indochina Time, but in repository for file asia they have only offset:

I don’t know is it issue or typo, cause I didn’t find any info when this Abbreviation was added https://en.wikipedia.org/wiki/UTC%2B07:00

For our customers, I added this step before compiling tzdata sources:

# set Asia/Bangkok for Thailand to use name instead of digits in timezone, affecting on Asia/Vientiane for Laos and Asia/Phnom_Penh for Cambodia

sed -i -e '/# Thailand/,/Vientiane/s/+07/ICT/' $(pwd)/asia

but maybe it doesn’t require and you will add corresponding changes in the main source code.

BTW, during my investigation, I observed that several time zones have same behavior, ex.:

Uzbekistan - Asia/Samarkand | Asia/Tashkent - UZT — Uzbekistan Time

Vietnam - Asia/Ho_Chi_Minh - ICT — Indochina Time

Singapore - Asia/Singapore - SGT — Singapore Time

Saudi Arabia - Asia/Riyadh - AST — Arabia Standard Time

Please give me explanation of this, is it correct to use Offset instead of Abbreviation or it will be fixed in future?

Best regards,

Evgheni Antropov

Software R&D Engineer

+373 22 404 665