I was at 7000 south and redwood, in my dates car, heading home. My date noticed these two lights just standing still. At first I thought it was a plane. But the lights weren't moving, just standing very still. As we got closer, between the two bright, white lights was a cylinder shaped figure. It turned into a glowy purple, and than slowly turned red, than blue. As we passed I looked behind me to watch. Than it slowly started moving towards the northern side of utah while changing into the three colors. Than I looked away. I felt very excited and shocked. I couldn't believe my own eyes. Before I had spotted the ufo I was a bit tired. During, I was confused and a bit scared.