Well, after midnight the watch rolls to Sunday, and if the clock is then turned back before 0100, it will appear to be just after 11pm - on a Sunday. Later, the watch will see another midnight in an hour's time, and the watch will then think it is Monday as the calendar has not been changed when the clock was put back an hour.In the interest of not appearing like an idiot, I'm going to pretend I understood that.It could have been worse. You could have turned the clock back just after midnight rolled by, gone to sleep, and woken up and looked at your watch to find it was Monday.We switched the other week here in the UK. I forgot all about it and got up at my usual time. What a berk.
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I think that is why clocks generally change at 0200, to allow a comfortable buffer of one hour, to avoid this sort of calendar rollover problem in today's working modern society.