How do you set the clock in a 97 blazer

These instructions will only work if the audio system is STOCK (meaning the original AC-Delco radios GM used/uses). Usually on older AC-Delco/Remy Radio, press the "set" button and it will take you back to the radio station frequency, then push the left knob inward, then it will take you back to the time again. Before the "set" mode ceases, use the seek and scan buttons to change the minute and hour for the time, until you get to the time you want. Other models will have the "set" button being a small almost hidden button, you can use a paper clip pin end to depress. Which will initiate the "set" mode, then you can push in the left or right knobs and the time mode will come on. Then using seek rocker switch or the seek and scan buttons the time minutes and hours will start to change. The last type is where you have to either hold down the set button then use the seek and scan buttons or you have to hold down the set button for about 4 seconds then the clock will go into a blinking or set display mode, for which you can use either the knobs or the seek and scan buttons to produce minute and hour change display on your clock