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At 00:10 the date changes, at 01:30 the day changes to the same day in the second language, and the day/date transition is completed at 03:00, when the day changes in the chosen language. Saturday is displayed in blue, Sunday in red and the other days of the week in black.
The day can be quick-set by pulling out the crown one click. Turning the crown changes the date accordingly. Moving forward a month can be done in seconds. Changing the day is trickier. This is done by setting the crown in the outermost position, the second click, and turning the crown a full 24 hour advances the day by one.
Best is to first set the day this way (plus choose the language of the day), and secondly set the date with the quick-set way.
The central seconds hand can not be hacked. Therefore if you wish to set the watch to the second exactly, you must wait until the watch comes to a halt, and then set the day/date/time, and start shaking the watch when the seconds hand is synchron to the verification time signal. This is not, I repeat NOT an elegant way to set a watch.
http://members.chello.nl/~h.mennink//watches/_private/seiko5.htm