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If the time is between midnight and 1 AM, call the hour "00" instead of "12". If the time is between 1 AM and 1 PM, both systems are exactly the same. If the time is between 1 PM and midnight, add 12 to the hour.
With the ignition off, press and hold hour and minute buttons at the same until the time changes to 12 hour format.
Press the MODE button 3 times. Press the LAP/RESET button until the hour flashes. Press the ST./STOP button to change the hour. Press the LAP/RESET button again to select the minutes. Press the ST./STOP button to change the minutes. Press MODE again when you're finished setting the time.
60 minutes are in a hour, so 60 = 100%. Let's say you wanted to know 12 minutes. 5 x 12 = 60, or 5 lots of 12 minutes = 100%. 100% divided by 5 is 20%. This means that 12 minutes is 20% of an hour. Converting this into decimals is easy, and it would be 0.2.
you have to be 12+ to do the 40 hour famine but if you are younger than that you can do the 12 hour.