I am assuming that you mean "how do you change the time from a 24 hour clock to a twelve hour clock." Just subtract 1200 hours from any time over 1200H. 0000H is midnight. 0100H is 1:00 am etc. up to noon. 1200H is Noon. 1300H is 1:00 pm (ie 1300 - 1200 = 100 = 1:00 pm). 1600H would be 4:00 pm (1600 - 1200 = 400 = 4:00 pm). 2200H is 10:00 pm (2200 - 1200 = 1000 = 10:00 pm).
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It is important because if you didn't, you would be measuring 12 hours instead of the full 24. I think...
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.
12 Noon
No such time as 12 pm . It either 12 noon or 12 midnight. 'pm' are the initials for the Latin words ' post meridian', which in modern English means 'after noon'. If the time is 12 noon, or 12 midnight it is neither 'am' nor 'pm'. However, if you mean 12 noon to 2;00 am, the length of time is 14 hours. Also if the time is 12 midnight, then to 2;00am the time is 2 hours.
With the ignition off, press and hold hour and minute buttons at the same until the time changes to 12 hour format.