iwc IW376501 Mode D'emploi page 19

Date and day setting 16 | 17
If a month has fewer than 31 days, you will need to set the date manually to
the first day of the following month. Release 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 pm and 2 am because the movement
automatically advances the date during this period and the change mech-
anism could be damaged.
Time setting
Pull out the crown to position 2. This will stop the movement. To set the time
accurately to the second, it is best to stop the movement as the seconds
hand passes 60. Now move the minute hand a few minute strokes beyond
the time to be set. Then position the minute hand by moving it gently back-
wards until it is exactly above the correct minute stroke. This ensures that the
minute hand begins to move immediately when you restart the movement. To
start the seconds hand, push in the crown to position 0. When setting the
time, please be aware of the date change, which always takes place at
12 midnight. If this change has already taken place at 12 noon, you must
move the hands forwards by 12 hours.
Important: Although the watch is water-resistant in positions 0, 1 and 2, the
crown should always be screwed in again for normal use (position X).