How do you change the time on a 2005 gmc sierra with a standard amfm radioclock?

Answer 1

That should be covered in your owners manual.
On My 04 Canyon there are 2 small button just below the tuning knob that allow the time to be reset. Good Luck and Remember.
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See My Bio For Information & Contact Details. To change the time on my 2004 Sierra all I had to do was turn off the radio, then hold down either the hour or minute button for about 5 seconds, then the time will change

Answer 2

To change the time on a 2005 GMC Sierra with a standard AM/FM radio clock, first turn the ignition key to the "ACC" position. Press and hold the "CLK" or "Clock" button until the time display starts blinking. Use the seek or tune buttons to adjust the hours and minutes, and then press the "CLK" button again to set the time.