How can I change my atomix clock from military time to regular time?

you have it set on 24 hour time instead of 12 hour time
it will change over at midnight to military time as that is when the 24 hour period ( military time ) starts

Have a look at the manual


Download Center Download Software Firmware Drivers Manuals Samsung

Most clocks that have Military time on them will change to regular after going thru the Military mode.

What make and model clock?

The manual is available at Bose.com and page 17-18 shows the detail.

To set AM/PM (12 hour) or Military (24 hour) time - Press the On/Off button once to turn your Wave radio off.

Press and hold Clock Set, and then press On/Off to switch between AM/PM (12 HR) or military (24 HR) formats

You can reset the time from military to regular time by holding down the time button and let it cycle to the normal time. I hope this information help you with your problem.

This is controlled by hardwired switch (12/24) OR digitally during menu setup sequence.

Disable the "Automatic update" feature and set the clock manually.
To do this go to Menu, settings, initial setup, time and date, Autoupdate>Off, then set the clock and date.

To set AM/PM (12 hour) or Military (24 hour) time - With the system off, hold
down Alarm Setup and press On/Off to switch between AM/PM (12 hour) and Military
(24 hour) time formats.

With the sytem off, hold down the Alarm Setup button and the On/Off button to switch between 12 hour (AM/PM) and 24 hour (Military) time. If you need the manual go to
http://www.bose.com/controller?event=VIEW_STATIC_PAGE_EVENT&url=/customer_service/owners/guides/music_system.jsp