Change time manually on iPhone?

I have an iPhone 4S. The time sets by itself. At school, the clocks are about 2 minutes faster then my phone, and its really annoying as I need to be certain places in a few minutes, so that makes a big difference. Is there any way that I can change/set the time manually so that it is the same as my clock at school?

The phone has the correct time, it syncs up with the gps. I don't think it can be manually changed. Apple has made their phones so you can't do anything they don't want you to do. It has lots of restrictions that other manufacturers don't.

Go to settings/general/date and time/uncheck set automatically then change time

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