IWC

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Calendar function

Hi. The instructions I saw stated you cannot reverse the calendar. Also, as with most calendars, it has a "do not adjust" time window if you need to advance the date (around 2200h to 0200h - don't quote me).
Excerpt from the manual:
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 10 p.m. You must not turn the hands back between 10 p.m. and 2 a.m. This is because the calendar does not move backwards by 1 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 1 day for a second time and thus indicating 1 day too many.