Press button S3 to switch mode Stopwatch HRM Recall Time Calorie Alarm Countdown Timer 3 Time Function and Operation 3.1 Time Operation There are two time zones: local time zone and second time zone. Press S1 to switch time zones. (Fig. 3) Local time zone: display the time in HH:MM seconds (in lower half), and day of week, day and month (in upper half). It displays PM icon in 12-hour format after 11:59 a.m. When hourly chime is on, chime icon is displayed. Press S2 to turn ON/OFF hourly chime.