IWC Schaffhausen AQUATIMER AUTOMATIC 2000 Operating Instructions Manual page 25

Winding position
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With the crown in the winding position (0), you can also
wind the automatic movement by hand. A few revolutions
of the crown are enough to start the movement. However,
it is better to wind the watch by turning the crown through
approximately 20 revolutions as this will ensure max-
imum accuracy.
Date setting
If a month has fewer than 31 days, you will need to set the
date manually to the first day of the following month. Re-
lease the screw-in crown and pull it out to position 1. You
can now set the date by turning the crown to the left
(rapid advance). You should not use the rapid-advance
function between 8 pm and 2 am because the movement
automatically advances the date during this period.