iwc 3972 Instrucciones De Manejo página 29

C R O S S I n G T I M E z O n E S a n d T h E I n T E R n a T I O n a l d a T E l I n E
W I T h T h E P O R T U G I E S E R P E R P E T U a l C a l E n d a R
d I G I T a l d a T E - M O n T h E d I T I O n " 7 5 T h a n n I V E R S a R Y "
Setting when crossing time zones:
– When crossing time zones in an easterly direction, you should simply set the time
forwards 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 automatic 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. This is because the calendar does not move backwards by one day when
the hands are turned back beyond midnight, but remains on the same day. If you
go past the end of the calendar's switching phase (i.e. beyond 2 a.m.) when turning
the hands back, you run the risk of the calendar advancing by one day for a second
time and thus indicating one day too many.
P O R T U G I E S E R P E R P E T U a l C a l E n d a R d I G I T a l d a T E - M O n T h
— 2 9 —
E d I T I O n " 7 5 T h a n n I V E R S a R Y "