IWC Schaffhausen AQUATIMER AUTOMATIC 2000 Mode D'emploi page 23

Winding position
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In the winding position (position 0), you can also wind
the automatic movement by hand. The movement will
start after only a few revolutions of the crown. However,
it is better to wind the movement fully with about
30 revolutions of the crown, as maximum accuracy and
a power reserve of about 42 hours will then be assured,
even after taking off the watch.
Setting the date
If a month has fewer than 31 days, you must set the
date by hand to the first day of the following month.
Pull the crown to position 1. You can now set the date
by rotating the crown to the left (quick setting).