iwc Da Vinci Chronograph Mode D'emploi page 21

Setting the date
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If a month has fewer than 31 days, you must set the date by hand to the
first day of the following month. Pull the crown to position 1. You can now
set the date by rotating the crown to the right (quick setting). You should not
perform quick setting in the period between 20.00 and 2.00, since the
date is moved forwards automatically by the movement during this period.
Setting the time
Pull the crown to position 2. This will stop the movement. For setting the
time accurately to the second, it is best to bring the movement to a stop as
the seconds hand passes over 60. You can now set the time by rotating the
crown and positioning the minute hand exactly above the minute graduation.
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
midnight (24.00). If this change has already taken place at 12.00 noon, you
must turn the hands forwards through 12 hours.