Hello! The tz database states +9 for Mongolia, but +8 is correct: Time Differences Most of Mongolia is 8 hours ahead of GMT. However, the three western aimags of Khovd, Uvs and Bayan Ulgii are GMT+7. Mongolia no longer puts forward its clocks by 1 hour in the summer months. Found on: http://www.mongoliatourism.gov.mn/fackpack.html Many greetings from Dani