If it is the five button type I have (there are several) you hold "SET" until a field starts flashing. Then hit "MODE" until you see "24-HR" in the display. Hit "LAP/RESET" once and it should display "12-HR". Hit set again and you are done. Also note that timex has all manuals available online for free,searchable by the "module number" you can find on the back plate of your watch. Hope this helps.
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