IWC Schaffhausen DA VINCI PERPETUAL Mode D'emploi page 28

Aggregate timing: You can add stop times together by press-
ing the start/stop push-button again after the first measurement
instead of the reset/flyback push-button.
Pull out the crown to position 1. In this position, you can use the
direct-advance function to move the calendar forward one step at
a time by turning the crown slowly to the right. The calendar must
not be adjusted between 8 p.m. and 2 a.m.
Please note:
– Turning the crown too quickly when setting the calendar might
result in a faulty advance and the desynchronization of the indi-
vidual calendar displays (e.g. date, day, moon phase). In such a
case, the movement needs to be reset by an IWC watchmaker.
– 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
forward beyond the correct date, you have two options: you
can either pull out the crown to position 2 to stop the move-
ment until the calendar setting matches the correct date once
again. This makes sense if the date has been set only a few
D A V I N C I P E R P E T U A L C A L E N D A R C H R O N O G R A P H
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S E T T I N G T H E C A L E N D A R