How do I change from 24 hour clock to 12 hour clock on my computer?

Im having a problem and I dont know how to fix it, for some reason I just got home from school and in this computer room there is no clock so I use the computer, and its driving me crazy that its in 24 hour clock form, can anybody help me fix it and put it back to 12 hour clock form? Thanks in advance to all who... show more Im having a problem and I dont know how to fix it, for some reason I just got home from school and in this computer room there is no clock so I use the computer, and its driving me crazy that its in 24 hour clock form, can anybody help me fix it and put it back to 12 hour clock form? Thanks in advance to all who help :)
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