Release : 11.3
Component : CA-7
CA7 has nothing to do with TIMEZONE command. CA 7 will use the local time and it get the time from job starts/ends from the SMF records and whatever time is in there is the time CA 7 will show the job ending.
It is possible that the end time can be before the start time if the time changes while the job is running. As far as SSCAN, there are no problems.
It knows what has already been schedule and changing the time will not affect it.