IWC Schaffhausen BIG PILOT'S Le Petit Prince Mode D'emploi page 28

Located at 12 o'clock on the dial, the annual calendar from
IWC shows the month, date and day in three separate, semicir-
cular windows. The change mechanism automatically takes into
account the differing lengths of individual months. However, the
annual calendar is unable to factor in the differing length of the
month of February or the leap years. Once a year, then, at the
end of February, it requires manual correction.
Please note:
– You must not move the calendar beyond the correct date.
The complicated movement is mechanically programmed and
cannot be moved back in time without making a professional
adjustment to the movement. However, if you do move the
date forwards beyond the correct date, you have two options:
you can either pull out the crown to position 2 to stop the
movement until the calendar setting matches the correct
date once again. This makes sense if the date has been set
only a few days ahead. Or you can manually adjust the date
forwards until the display shows the correct date. This is
recommended in the event of larger maladjustments.
– In order to avoid moving the calendar beyond the correct date
at the end of the month, we recommend that from the 30th
B I G P I L O T ' S WAT C H A N N U A L C A L E N D A R
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S E T T I N G T H E C A L E N D A R