Hi jackchenjob,
Thank you for contacting the Microsoft Community.
Allow me to provide you with information about the time zone difference for your scheduled exam.
When you check your Certifications dashboard, your exam appointment time is expressed in UTC. On the other hand, Testing Center exam times are expressed in the local time of the Testing Center. Also, appointment times on your confirmation email are expressed in local time, regardless of how they are delivered. Please visit this sticky post to learn more.
In the event that you have missed your exam due to time confusion, please reach out to Pearson Vue's support page (select your region) to assist you with rescheduling your appointment.

In case you need help with Microsoft Certification profile access/benefits and exam registration in the future, you can always post a new question so our team can give immediate assistance.
If this solves your problem, please indicate “Yes” to the question and the thread will automatically be closed and locked. In case we do not receive a response, the thread will be closed and locked after one business day. Please be advised that after the case is locked, we will no longer be able to respond. If the resolution provided did not resolve the issue, please post a new question.