Excellent reasons to have, every year, 1) two hours of time which use the same time notation (think about trains and flights arriving at those times), and 2)

Excellent reasons to have, every year, 1) two hours of time which use the same time notation (think about trains and flights arriving at those times), and 2) one hour which doesn't exist, leading to e.g. time interval between 1am and 3am being 1 hour.