iwc PORTOFINO CHRONOGRAPH Mode D'emploi page 20

The functions of the crown
Normal position
With the crown in the normal 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. The crown must always be in position 0
when you are wearing your watch.
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. 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 (rapid advance). You should not use the rapid-
advance function between 8 pm and 2 am because the
0 1 2
0 Normal position
1 Date and day setting
2 Time setting