What's with February?

How can it be March already? I've never understood why February only has 28 days. (I know, I know, 29 on leap year) Every other month has 30 or 31. It just makes no sense t me. If I were king, we'd take a day from January and one from March. They both have 31. We'd donate them to February, which would then have 30 (I know, I know, 31 on leap year) Makes sense to me.