Steffen Thorsen wrote:

Several reporters in the past on this mailing list have also reported GMT+8.

...and at least some sites I found with Google, including some in the .gov.mn domain, suggest that, at least at one point, they had DST, with the offset being GMT+09:00 during DST. That *might* be the source of the GMT+09:00.

Deborah Goldsmith <goldsmit <at> apple.com> writes:

On Mar 31, 2008, at 7:26 AM, Guy Harris wrote:

...

Steffen Thorsen wrote:

...

Several reporters in the past on this mailing list have also reported GMT+8.

...and at least some sites I found with Google, including some in the .gov.mn domain, suggest that, at least at one point, they had DST, with the offset being GMT+09:00 during DST. That *might* be the source of the GMT+09:00.

Any further thoughts on this? Is this considered enough information to correct it?

Thanks,

Deborah Goldsmith Apple Inc. goldsmit <at> apple.com

AS per article http://www.worldtimezone.com/dst_news/dst_news_mongolia01.html Mongolia is no longer observe DST and I believe that GMT+8 all accross the country. 02/08/2007, Mongolia - "Mongolia won't observe Summer Time (DST)"- from Embassy of Mongolia in the Russian Federation and MONTSAME - NEWS AGENCY. Alexander Krivenyshev http://www.worldtimezone.net/wtz-pacific24.php New York, NY

I'm still not hearing any closure on this issue. Do people agree this

is a change we should make, or is the feeling that there isn't enough

evidence yet?

Do I need to propose a patch?

Our best information comes from Steffen Thorsen's 2008-03-31 message:

eznis airways, which operates several domestic flights, has a flight schedule here: http://www.eznis.com/Container.jsp?id=112 (click the English flag for English)

There it appears that flights between Choibalsan and Ulaanbatar arrive about 1:35 - 1:50 hours later in local clock time, no matter the direction, while Ulaanbaatar-Khvod takes 2 hours in the Eastern direction and 3:35 back, which indicates that Ulaanbatar and Khvod are in different time zones (like we know about), while Choibalsan and Ulaanbatar are in the same time zone (correction needed).

This is good evidence that Choibalsan and Ulaanbaatar are now in the same time zone. What we don't yet know is when Choibalsan shifted its clocks to agree with those in Ulaanbaatar. Ideally, we'd use that instant in the time zone file. If the instant can't be learned, we'd put in some arbitrary cutover date with a note that it was arbitrary, a la... # Choibalsan, a.k.a. Bajan Tuemen, Bajan Tumen, Chojbalsan, # Choybalsan, Sanbejse, Tchoibalsan # XXX actual instant when Choibalsan switched from GMTOFF of 9 to 8 unknown. Zone Asia/Choibalsan 7:38:00 - LMT 1905 Aug 7:00 - ULAT 1978 8:00 - ULAT 1983 Apr 9:00 Mongol CHO%sT 2008 Mar 30 # Choibalsan Time 8:00 Mongol CHO%sT My Spanish was good enough to let me do research on the Cuban situation earlier this year; I'm not so blessed when it comes to the Mongolian situation. So: does anyone know when Choibalsan shifted clocks? If not, does anyone have insights into the best phony cutover date to use? --ado