Since the October update all my photos have uploaded to Strava with a time stamp of 01:00. I tend to ride between 17:00 and 19:00 local time
The time stamps on the activity itself are fine, just all the pictures Zwift uploads alongside the activity.
I have opened a couple of friends activities and seen timestamps of:
19:00 on an activity done at 5:27 their local time
18:00 on an activity done at 4:52 their time
Not the biggest problem in the world but I was looking into activity upload problems already and found it so… make of it what you will.