iwc Ingenieur Dual Time Operating Instructions Manual page 33

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t z c ( t i M e z O n e c O r r e c t O r )
Local times throughout the world are, for the most part, divided
into time zones with a time difference of exactly one hour between
each zone. The function of the TZC (Time Zone Corrector) permits
rapid adjustment of the time display in one-hour steps.
r e a d i n g t h e 2 4 - h O u r h a n d
The 24-hour hand shows the second time zone of your choice on
the 24-hour scale, which runs around the edge of the dial.
i n t e r n a t i O n a l d a t e l i n e
The International Date Line largely coincides with the 180th de-
gree of longitude on the surface of the earth. Yesterday's date
applies if this line is crossed in an easterly direction, and you
move into the next day if it is crossed in a westerly direction. The
same date applies throughout the entire world only once a day,
namely at midnight on the International Date Line.
i n g e n i e u r d u a l t i M e