My daughter is a little over 2 weeks old and she has her days and nights mixed up as well. She sleeps most of the dsy and is up all night. But the past 2 nights have been better she only woke up once or twice. So I'm thinking she will just get on a normal schedule herself soon, and hopefully so will your little guy.
My baby had her days and nights mixed up bad! She's 6 weeks old now and sleeps 8 hours at night and just naps during the day. I didn't do anything different. I just let her sleep when she wanted and she just got on a normal schedule all on her own