How do I set the 24 hour clock back to 12

Dozens of models to choose from. All questions on Fixya need 'make model (what it is)' as the first 3 words.

Here are some guesses. The 'control cover' is where you put the back-up battery.

To change the 12/24 hour time format, open the CONTROL COMPARTMENT COVER on the bottom of the clock and adjust the 12/24 TIME FORMAT switch to the desired format .

Self-Setting Clock - Brookstone

Instruction Manual - Brookstone

Brookstone https://manuals.brookstone.com > ... PDF 12/24 HOURS TIME DISPLAY SETTING 1. The "12h" or "24h" will start flashing in LCD2 (Default setting 12h).

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  of 6 Page 2 of 6 - Brookstone

  https://manuals.brookstone.com > ... PDF
  Features: x WWVB Radio Controlled Clock (Atomic Clock) x Time in 12/24 hour format x Manual time setting option x Time Zone setting: +/- 12 Hours from GMT.

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Setting The 12/24 Time Format; Setting The Daylight Savings ...

ManualsLib https://www.manualslib.com > ... > User manual
Brookstone TIMESMART Self-Setting Clock Radio Manual Online: setting the 12/24 time format, Setting The Daylight Savings Time. The 12 Hour Format Is Set As ...

Here are the instructions for changing the clock from 12 to 24 hour and back.

12-Hour, 24-Hour or Clock Black-Out
Your control is set to use a 12-hour clock.
If you would prefer to have a 24-hour
military time clock or black out the clock
display, follow the steps below.

Press the BAKE and BROIL HI/LO
pads (on models, use
the upper oven controls) at the same
time for 3 seconds, until the display
shows SF.

Press the CLOCK pad once. The
display will show 12 hr. If this is
the choice you want, press the
START pad.

Press the CLOCK pad again to
change to the 24-hour military time
clock. The display will show 24 hr.
If this is the choice you want, press
the START pad.

Press the CLOCK pad again to black
out the clock display. The display
will show OFF. If this is the choice
you want, press the START pad.
NOTE: If the clock is in the black-out mode, you
will not be able to use the Delay Start function.

Press and hold the "clock" button. You need to hold it for what seems like a long time - 10 seconds.

You can set the clock to a 12 or 24 hour system.
For 12 hour - Touch clock pad once Enter the time using the number digits (1:00-12:59) Touch clock pad again
For 24 hour - Touch clock pad twice Enter the time using the number digits (0:00-23:59) Touch clock pad again

Push the mode button twice to enter the "set time" mode. Once the digital display is blinking, keep pushing "mode" until the PM display section in the upper left corner comes on. Once that happens you are back to the 12 hour clock. To set the clock, use the 1-4 buttons to set the hours and minutes.

Hope this helps.

Well...this solution may be a few years late for the original poster, but I did figure it out on mine. If it's the same clock that sits on a rubber stand and you press the top edge back to activate the light, to toggle between 12 hour and 24 hour clock, you press the + and - buttons, simultaneously, for 3 seconds.

No Problem here ya go


To change the clock to 24-hour format:
1. Press and hold the CANCEL and Delay
pads for three seconds.
2. Press the More+ or Less - pad to select
12 or 24 hour.

When setting-up the time (by pushing the "mode" button), the alarm time set comes up first, followed by the time set.
When setting the proper hour in this mode, simply continue through the military "24 hour" cycle and the second cycle of 24 hours will be in the 12 hour format.
Continue through and finish the mode set-up function and your up and running. --

Push the "mode" button twice to enter the time change function. Once the display is blinking keep pushing the mode button until you see the "pm" icon on the LCD display. When that happens set the clock as you normally would using the 1-4 keys.

Remember to check if the 12 hour clock is set to AM or PM.

Good luck.