Ad scheduling for your AdWords campaigns is based on the time zone you have set for your account. Your ad will appear during the hours shown in your account -- not in the time zone of the regions you have targeted.
For example: Assume your account time zone is set for Amsterdam, but your ads are targeted to Bangkok, six hours ahead. When you schedule your ads to run from 1:00 until 3:00 pm, the ads will run from 1:00 until 3:00 pm Amsterdam time. That means that in Bangkok, six hours ahead, they will be running from 7:00 until 9:00 pm.
