Most mechanical and automatic watches, in their respective user manuals, tell the user to never set the date between the hours of 9:00 pm and 3:00 am or you could cause internal damage. I have done this without thinking maybe a couple of times. As far as I know, there was no damage. Just wondering if such an act will automatically cause damage or can one sometimes get away with it? Of course, as a rule, I never do this and make sure that the hands are moved somewhere around the 6 before I set the date.
Joe
Joe