Try this and report back whether it works for you or not:
Press the MODE button (B) three times to enter the time setting mode. Press the RESET button (A) to tab through seconds, minutes, hour. The ST/STP button (C) scrolls through the number choices. When selecting the hour, if you want 12hr time format make sure the AM or PM is displayed next to the number you desir. There are 48 possible selections for the hour - 12 for AM, 12 for PM, and 24 for military time. Keep cycling through until the correct hour comes around. Once you have the correct choice, press the MODE button once more to exit time setting mode.
http://fitness.manualsonline.com/support/armitron/watch/i-cannot-get-my-watch-off-military-time-5752670
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