Time zones in Canvas are available in three different flavors, and should be configured accordingly in order to display the correct time.
System-wide time zone: This is the default time zone set by the Canvas administrators that applies to all courses within an account (root-account setting).
Course time zone: This time zone setting can be changed per course to suit the needs of the teaching team; otherwise it will follow what is the default system-wide time zone
Personal time zone: This time zone setting should be configured by users in order to accurately scale and display the course's time zone to their own locale time.
Note: To see an assignment's original time zone/due date, hover over the time and due date to see both times and dates.