IWC Schaffhausen 3795 Mode D'emploi page 28

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d a t e s e t t i n g
If a month has fewer than 31 days, you will need to set the date
manually to the first day of the following month. Release the
screw-in crown and pull it out to position 1. You can now set
the date by turning the crown to the right (direct advance). You
should not use the rapid-advance function between 8 p.m. and
2 a.m. because the movement automatically advances the date
during this period.
a Q u a t i M e r c H r O n O g r a p H