SGH-S275G Current time and date

If I am outside wireless network coverage, how can I set the current time and date (not format) in the sgh-s275g cell phone? Samsung tech support doesnt know. Thanks.

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I took a look at the manual and it doesn't look like you can, which is kind of silly. It just says "Once the phone finds a signal, the time, date, and day appear at the top of the display."