I started my new job last December and I got the chance to learn something about Azure Devops (Visual Studio Online).
Today I notice one thing: If I created the pull request, after team members approved it, I marked it Complete. Why was the timestamp set to UTC time zone?
After looking into this interesting issue, I finally find out one fact: the default time zone is set to UTC in Azure Devops. If we would like to change it to pacific time, we can just go to this link and update the time zone to Pacific Time.
After updating it and going to my pull request again, the time zone has been updated to Pacific Time.