Perpetual Calendar - Patek Philippe 5204 Mode D'emploi

SETTING THE TIME
To set the time, gently pull out the crown and
move the hands in either direction. Once you
have set the correct time, push the crown home
again. The day/night indicator at 7:30 allows you
to verify whether the time displayed by your
watch is between 6 am and 6 pm (white) or
between 6 pm and 6 am (blue). If you advance
the hands beyond midnight, all calendar displays
will switch to the next day as well. We advise
against moving the hands beyond midnight in the
counterclockwise direction because this would
desynchronize the calendar mechanism. However,
this will not damage the movement.
Caution: Remove the watch from your wrist to adjust
the time. This way, you can avoid lateral pressure on the
winding stem. Please use your fingernails to pull the crown
out and turn it gently between two fingertips.

PERPETUAL CALENDAR

The perpetual calendar indicates the day of the
week, the date, and the month, automatically
taking into account months with 28, 29, 30, and
31 days. It switches directly from September 30 to
October 1 or from February 28 to March 1. In leap
years, it indicates February 29 before switching to
March 1. In addition to the date, day, and month,
the watch also features a leap-year display. The
moon-phase display is highly accurate: it deviates
from the true lunar cycle by merely one day every
122 years. If the watch is wound daily, the perpe-
tual calendar will not require any manual cor-
rections before February 28, 2100; this is a secular
year that by exception omits the 29th of February.
Caution: Please do not perform any calendar or moon-
phase adjustments between 5:30 pm and 2 am. To make
sure your corrections do not interfere with any switching
actions, set the watch to 6 am and observe the color of the
day/night indicator (must be white).