iwc AQUATIMER CHRONOGRAPH Operating Instructions Manual page 9

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 and day 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 right,
and the day by turning it to the left (rapid 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.