i think I recall that if you tap on the clock a few times it causes the clock to check for update. Not if it will help for daylight savings, but it worked when I crossed state lines into a new timezone.
No need to hyper-ventilate here. A week after the recent change to daylight (3/2020) I've noticed that the clock on my Model 3 still shows winter time. As I just touched the clock on the display once- it immediately changed to the correct summertime. No sweat.