I have a Kenwood DD4018Bt and want to know if the clock can be set to display 24hr clock?

Press and hold set clock for 6 seconds. CLO will appear in the display. 2. Continue holding the key until 12Hr dAY or 24Hr dAY appears in the display and the control beeps once.

Try the owners manual?

I don't know what your dash layout is but you must be able to set the clock time.

If the clock display is in the hooded centre dash panel press set for more than one second to enter clock/date menu then press set briefly to move through the settings. Try pressing H and M at the same time to change from 12 to 24 clock.

Take battery out and unplug to force a reset.
Hold Display until it starts flashing 12 hr
----use tuning buttons if you need to change that to 24hr
Tap Display to confirm setting and move to next stage
Repeat the same steps of tap Display and then use tuning to adjust up or down for the hour and minutes.

Make sure to increase hour setting enough to have the "pm" show up for times after noon when using 12 hr format

click on mode or setting option.then you will see the default time.edit it..try to change it using select or any mode available.there you can see 24hr clock and 12 hr clock.select which one you want.if it is in 12 hr then the time will be displaying like eg:7:00am or 7:00pm it means that it is in twelve hours.if it is showing 7:00 or 19:00 it means it is in 24hr clock.

1. enter stanby
press the [src} button
select the "stby" display 2. Select the clock display
press the [clk] button
3. Enter clock adjustment mode
press the [CLK] button for at least 2 seconds the clock display blinks
4 Adjust the hours
push the control know towards [fm] or [am] Adjust the minutes - push the control knob towards ['>'] 5. exit the clock adjustment mode
press the [clk] button.
if this helped you please feel free to rate the solution. If you need further assistance please feel free to follow up with a comment. Thanks, Midwest-tek

This is taken from the user manual.
If switched on, press the ON button to turn the unit off.
Press the CLOCK/TIMER button for at least 2 seconds so that the clock icon blinks on the display.
Press the MEMORY button. The hours display blinks.
Turn the VOULUME control to set the hours.
Press the MEMORY button. The minutes display blinks.
Turn the VOULUME control to set the minutes.
Press the MEMORY button. The clock starts.
NOTE: the time can be set accurately by pressing the MEMORY button when a time signal is heard.

Changing the clock to 12 hour display.
If switched on, press the ON button to turn the unit off.
When the clock is display, press the MEMORY button and hold it, then press TUN UP buttom (this will change from 24hr format to AM/PM format)

To set the Time all you have to do is hold memo/c.adj while on standby, the screen will flash 24hr if you press tune it will flash 12hr pick weather you want 12hr or 24hr and then press memo/c.adj to set the hours press tune then hold memo/c.adj to get to the minutes and then press tune to get the minutes set

Enter Menu mode
Press the [MENU] button for at least 1 second.
"MENU" is displayed.
1 Select Clock Adjustment mode
Press the [FM] or [AM] button.
Select the "CLK ADJ" display.
2 Enter Clock Adjust mode
Press the [4] or [¢] button for at least 1 second.
The clock display blinks.
3 Adjust the hours
Press the [FM] or [AM] button.
Adjust the minutes
Press the [4] or [¢] button.
4 Exit Clock adjustment mode
Press the [MENU] button.

work the knobs ,hold it down for 10 secs and it should change

First, set the clock if it isn't already set. You need to get your cd player into standby mode and then hold the "boost" button. This should get you into a menu. Use the up and down pad to scroll through the options until you find "clock" hold the center button to get into the mode, to set the clock. Once in use the up and down, left and right pad to set the time. Then press the menu button to get out. Press the source button to get back into a normal mode, then hold that "boost" button again. This should bring you into a different menu. scroll through the menu until you see "display" and you should be able to choose to display clock in there. I hope I didn't steer you wrong. Let me know if you need further help. Good luck
-Andrew Hawkins