How to get him to go to bed later

My son is almost 15 weeks and just started sleeping through the night 8-9 hours for a week and a half now. The only thing is he falls asleep anywhere between 6:30-7pm and wakes at 4:30-5am. I would like to get him to go to bed a little later so he wakes up later if possible... I try to keep him awake longer but he just ends up crying and cranky. He takes cat naps during the day (15-45mins) and one long nap (2-3hours). Any advice?