From the POH:
8. CLOCK. (Mechanical Clock -Optional)
The electric, digital, panel mounted clock, may be Used/set by the following procedures:. Three buttons are located below the digital face of tKe clock and identified as
START/STOP. CLEAR 6 MODE.
Normal or Elapsed time.
MODE - Push to switch from normal time to elapsed time.
STARTISTOP - Push to start or stop seconds when in elapsed time mode.
CLEAR - Push to reset elapsed time to Zero.
Set Hours, Minutas or 24 vs 12 hourtime
Push and Hold CLEAR buttons for 4-5 seconds to enter clock mode; 12 H or 24 H will
Flash.
Push both START/STOP button to select either 12 or 24 hour mode.
Push CLEAR to select hours (hours flashing/minutes steady) or minutes
(hour steady/minutes flashing) for setting. Push START/STOP to increase either hours or minutes until desired time is set.
In 12 H mode set PM (P) if necessary. Push MODE to return to normal time
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