BIG PILOT’S WATCH PERPETUAL CALENDAR
BIG PILOT’S WATCH PERPETUAL CALENDAR
— 3 2 —
— 3 3 —
CROSSING TIME ZONES AND THE INTERNATIONAL DATE LINE WITH THE
BIG PILOT’S WATCH PERPETUAL CALENDAR
Setting when crossing time zones:
– When crossing time zones in an easterly direction, you should simply set the time forward to the
new local time.
– When crossing time zones in a westerly direction, you can set the hands of your watch back to the
actual time of day. When doing this, however, you must not move back into the calendar’s auto-
matic switching phase, i.e. beyond 2 a.m. If this situation occurs when you are travelling west, you
should set the local time of your destination before 8 p.m.
You must not turn the hands back
between 8 p.m. and 2 a.m.
Setting when crossing the International Date Line:
– When crossing the International Date Line in a westerly direction (you enter the next day, regard-
less of the time of day), simply turn the time forward to the new local time, and the date change will
take place automatically.
– When crossing the International Date Line in an easterly direction (you enter the previous day, regard-
less of the time of day), you must likewise set your watch forward to the new local time. However,
your watch will now indicate the wrong date (one day too many). This incorrect date indication can
be corrected by resetting the hands twice, by 12 hours on each occasion:
– Setting the watch back by 12 hours during the afternoon between 2 p.m. and 8 p.m. will prevent
the calendar from advancing at midnight.
GM
T
–11 –10 –9 –8 –7 –6 –5 –4 –3 –2 –1
0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +10 +11 +12
INTERNA
TIONAL
DA
TE LINE
INTERNA
TIONAL
DA
TE LINE
