This is very interesting as mostly everyone's favourite time seems to be towards the end of the day - evening/night time.
To be honest, I would say there isn't a favourite time of day for me, because the night times maybe most stressful like the night before an exam and the day time can be stressful due to maybe work or studies. Also the night time can be relaxed as you wind down from the day or the day can be nice if you go out or relax like on a Sunday. I guess I would say it depends mostly on what you do at the time of day and it could vary every day. But if I had to choose, probably the time just before you go to sleep, when you're in bed relaxed and waiting for sleep to arrive.
Nice Topic 👍🏼