iwc portuguese chronograph classic reference 3904 Operating Instructions Manual page 9

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D A T E S E T T I N G
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 the crown out to position 1. You can now set the
date by turning the crown to the right (direct 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.
T I M E S E T T I N G
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. You
can now set the time by turning the crown and positioning the minute hand exactly
above the minute stroke. 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.
P O R T U G U E S E C H R O N O G R A P H C L A S S I C