The owner's manual that was sold with it should guide you. If it's missing, get a good hand-lens. Take the watch under a good source of light, and aim the hand-lens to the edges of the watch. You should see 12/24hr button. Press the button once. The time should change from military. If it doesn't , press and hold the shortest button for about 5-seconds. Then press the button that is marked 12/24HR.
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