Nap time?

So my little guy is 7 weeks old. At about a month old, he decided maps were for losers. Getting him to sleep during the day is a real chore and full of frustration. He cries and fusses because he's so sleepy, but fights it with every ounce of energy he has. He was sleeping in his swing, but that has lost its effect as well. I'm rocking him now and he's sleeping in my arms, but I'm supposed to be working.  I can't get anything done if I have to hold him all day! I was thinking about using our bedtime routine as a nap time routine as well. Would that be a good idea or will it cause him to get his days and nights mixed up?