UTC offset for Asia/Choibalsan

We received a bug report claiming that the tz database UTC offset for Asia/Choibalsan (GMT+09:00) is incorrect, and that it should be GMT +08:00 instead. Different sources appear to disagree with the tz database on this, e.g.: http://www.timeanddate.com/worldclock/city.html?n=1026 http://www.worldtimeserver.com/current_time_in_MN.aspx both say GMT+08:00. Do we have any independent confirmation of the correct offset for Asia/ Choibalsan? Thanks, Deborah Goldsmith Apple Inc. goldsmit@apple.com