I just had my watch battery replaced and I usually run it on the 24 hour format but I can not remember how to get it to change form the 12 hour format to the 24 hour format. I have tried all kinds of different combo-nations and so did the watch repair guy and neither one of us could get it. Please help me with this if you know how to change it.
PS: I Have had this thing for so long that I don't have the manual anymore.

Bentrods, December 2007

John hit the nail right on the head...Perfect...24 hr display will now show 1 thru 12, with an A for AM, and a P for PM.

Now for another issue with the same TS-1200, my calendar (display to the right of the Day of the Month) will not allow any adjustment beyond '71' it shows the month 1 thru 12, but the year range is '41' thru '71'. Any suggestions on setting the appropriate year would be appreciated.

Dander, March 2012

Follow this exactly. With the cover still off, after you change the battery and it is in place, you must take a tweezers and touch the plus side of the battery and a spot marked "AC", all clear, on the housing. This will reset the memories on the watch. Your temperature should come on. It might take a couple of tries. Give the watch a few minutes to regulate the temperature.

Uncle Kenny, January 2008

While in the main display:
- press and hold the bottom-right button and press the top-left button to toggle between 24hr/12hr display mode.

John, December 2007

While in the main display:
- press and hold the bottom-right button and press the top-left button to toggle between 24hr/12hr display mode.

John, December 2007