Clock will not set time

1. Press and hold the 'preset/clock/defrost' button. The clock will display, with the hours flashing.
2. Twiddle the dial to set the hour.
3. Press the button again. The minutes will now be flashing
4. Twiddle the dial to set the minutes.
5. Press the button again.

That's it!

To set the clock, press
"Clock"
once
or
"Timer/Clock"
twice
(depending
on your keypad)
.
The colon symbol (:) will flash.
Enter time of day.
The time appears
in the window; the colon continues
to flash.
Press
"Clock"
or
"Timer/Clock"
again - colon stops flashing; time of
day is set !

press,timer/clock ,colon will flash ,enter correct time{i.e. 12:34},press clock/timer again,,all set,if it doesnt work,return it to where you bought it,

1. Open door
2. Press clock/Kitchen Timer button the display will show "0:00" with the hour"0" flashing.
3. Enter the correct hour by turning the potary dial. Enter 1-12
4. Press clock/Kitchen Timer button the display will show "0:00" with the minutes "00" flashing.
5. Enter the correct minutes by turning the potary dial. Enter 00-59
6. Press clock/Kitchen Timer. The colon will remain flashing.
7. Close the door.

see this steps and fix it. God bless you

Reset the clock. Press "Clock" and the correct time, using the number pads. Press "AM/PM" if applicable, and press "Start" or "Clock" to confirm.

2 Press "Timer On/Off" to reset the timer if nothing on the touch pad will operate. Use the number pads to select a new timed amount, if desired, and press "Timer On/Off" to start. Press again to cancel.

3 Press and hold "Clear/Off" for three seconds if the timer will not function or is blinking when you touch the pads. This will release the "Child Lock" feature. Make a new touch pad selection.

4 Disconnect power to the microwave if following Steps 1 through 3 does not resolve the blinking timer. Wait a few minutes, and then restore power to reset the microwave.

However if the problem persist the display board
main control board is faulty

According to the manual this is how to set clock.

To set the clock, press "Clock" once or "Timer/Clock" twice (depending on your keypad).
The colon symbol (:) will flash.
Enter time of day. The time appears in the window; the colon continues to flash.
Press "Clock" or "Timer/Clock" again - colon stops flashing; time of day is set.

If you need the manual it is on link below.

http://service.us.panasonic.com/OPERMANPDF/NNH624-SET%20UP.PDF

Good Luck

Operating functions:
To set the clock, press and hold the clock/timer button for three seconds. A clock icon will appear on the left side of the screen. Input the time using the numerical buttons and then click the clock/timer button to save the time.
To set the timer, press and release the clock/timer button so that the display shows all zeroes. Enter the desired time using the keypad. Press start/stop to start the countdown. The countdown may be paused by pressing the stop/start button and resumed by pressing the same button again.
When countdown is complete, timer will beep continuously for thirty seconds and display will flash. Timer will then beep every ten seconds for ten minutes until the stop/start button is pressed.
This timer will also time up to time activities. To start count up, press clear/memory so timer reads all zeroes. Press stop/start and a plus sign will appear on the right side of the screen as the timer begins counting up.

Touch STOP/CLEAR pad.
Touch TIMER/CLOCK pad.
Enter the correct time of day by touching the numbers above in sequence.
(for example: for 12:30, touch 1 2 3 0)
Touch TIMER/CLOCK pad again.

Pressing "timer/clock" button 4 times turns on and off demo mode.