IWC Schaffhausen Da Vinci Mode D'emploi page 22

Setting the time
Pull out the crown to position 2. This will stop the movement. To set the
time accurately to the second, it is advisable to stop the movement as the
seconds hand passes directly above the 60. Now move the minute hand
a few minute graduations beyond the time to be set. Then, position the
minute hand exactly above the desired minute graduation by moving it
backwards slightly. This procedure ensures that the minute hand starts
moving forwards immediately when the movement is started up. Now push
back the crown to position 0 to start the seconds hand. Moving the hands
forwards past midnight causes the calendar to switch to the following day.
When advancing the calendar, you can follow and observe the automatic
change sequence. In order to avoid incorrect adjustment or even damage
to the mechanism, particular attention must be paid to the following:
• You must not move the hands back between 20.00 and 2.00 under any
circumstances.
• You must never move the hands back in an anti-clockwise direction
past 2.00.
Important: Although the watch is water-resistant in positions 0, 1 and 2,
the crown must always be screwed in again for normal use (position X).
Setting your watch correctly
To set your watch correctly, proceed as follows:
• Release the crown by turning it in an anti-clockwise direction.
• Wind the movement until fully wound (approximately 40 rotations of
the crown).
• Pull out the crown to position 2 and move the hands forwards to
approximately 4.40. This ensures that the calendar mechanism is not in
its automatic change phase and that you can also observe the calendar
displays easily.