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there will be different clocks and ways to set them based on your interior trim package, i have consulted an oracle but cannot divine which package you have. so you will have to do it the way everyone else does by reading your owners manual.
. U can get a free owner manual @ :gm.com/gmownercenter/gmc/ I'm amazed at how many people throw out their manual--not fair to future owners! (you), there's lots of great info in it. Let me know if u have any trouble finding it. Good luck w the new vehicle.
31 sounds about right for a sierra and the clock settings are in the menu. Hit menu then you have a small round knob to advance the hour or you have two small buttons in the lower right hand corner of the radio.