Possible cause:
The clock is not set to the correct time.
Confirm with OK button
Press OK to confirm
Time gets highlighted. Press OK to select.
Use the ↑(A) and ↓(B) keys to change the highlighted digit. Use the ←(C) and →(D) arrows to select other digits of the time. Use the ↑(A) and ↓(B) keys to input a new value.