Definition: In this task you will be given a passage and a yes/no question based on the passage. You should answer the question using the information from the passage.
Input: passage: Thailand follows UTC+7, which is seven hours ahead of UTC. The local mean time in Bangkok was originally GMT+06:42:04. Thailand used this local mean time until 1920, when it changed to Indochina Time, GMT+07:00, ICT is used all year round as Thailand does not observe daylight saving time.
 question: is all of thailand in the same time zone?

Yes