IWC Schaffhausen PORTOFINO CHRONOGRAPHE Mode D'emploi page 25

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D A T E A N D D A Y 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. Pull out the crown
to position 1. You can now set the date by turning the crown to
the right, and the day by turning it to the left (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 and the day during this period and the change mechan-
ism could be damaged.
P O R T O F I N O C H R O N O G R A P H