Your watch can switch between its main-dial and sub-dial.
Both the conditions for DST (Daylight Saving Time) set in the main-dial and the conditions for DST (Daylight Saving Time) set in the sub-dial switch.
This comes in handy in the following situations.
Matching the main-dial to the time for the time zone set in the sub-dial
To use you watch, adjust the main-dial to the local time, and then, after returning home, restore the main-dial to the sub-dial’s Japan Standard Time
How to switch the main-dial and sub-dial
Press and hold buttons A and B at the same time (1 second)
The seconds hand indicates the time zone for the basic time that was switched. The indicator hand indicates the setting status for DST (Daylight Saving Time) of the basic time that was switched.
Afterward, the main-dial’s hour and minute hands, sub-dial, date, and day switch, in that order.
Finally, the seconds hand returns to the time display, and the indicator hand returns to the charging status display.
The indicator hand spins a number of times if the date changes; however, this is not a malfunction.
The buttons cannot be operated while the hour and minute hands, indicator hand, date, and day are moving.