How to Change a Clock to 12 Hour Time
The 24-hour clock format is a military format of time keeping in which the day is divided into 24 hours, with each hour represented by numbers ranging from 0 to 23. The 12-hour clock time is a format that breaks a 24-hour day into two periods (a.m. and p.m.). Whether you are using a PC or Mac, you can change your 24-hour clock system to 12-hour clock time in minutes.
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Instructions
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Mac Users
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Click the "Apple" logo located in the top-left corner of your desktop and click "System Preferences" to launch the System Preferences window.
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Click "Date and Time" under "System" to launch the Date and Time window. Click the "Clock" button. Uncheck the "Use a 24-hour clock" check box.
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Close the Date and Time window. You should now see the 12-hour clock system in the top-right corner of the screen.
Windows Users
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4
Click the Windows "Start" menu and click the "Control Panel."
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Double-click "Date, Time, Language and Regional Options" and click "Change the format of numbers, dates and times" to launch the Regional and Language Options window.
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Click the "Customize" button. A new box opens. You will see "HH:mm:ss" if you are running a 24-hour clock. The two uppercase H's make the clock a 24-hour clock. Replace the two uppercase H's with two lowercase h's. It should look like this: hh:mm:ss. Add two lowercase t's at the end to indicate either p.m. or a.m. The final result should look like this: hh:mm:ss:tt. Click "OK" to save the changes and click "OK" again. You should see the 12-hour clock system on the system tray.
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