Module No. 5719
Swapping Current Location Time and Dual Time
You can swap the time in your current location with the Dual Time by holding down (B) for at least three seconds.
Pressing (B) also causes face illumination to turn on. Keep (B) depressed for at least three seconds.

Note
If you are using the small hour and minute hands for Dual Time, only the time in your current location will be swapped with Dual Time. Dates are not swapped.