When I was in college my roommate used to say that it was always Thursday.
She was right. If it isn't actually Thursday, it will be Thursday tomorrow or it was Thursday yesterday. Thursday is a good day and a great night for happy hour. (Not that I've been to happy hour since I got pregnant, but I used to have a really great time at happy hour.) Even Thursday night TV is usually good.
I guess once you make it to Thursday you've basically made it through the week and you stop paying attention to what day it is until Monday. No one wants to think too much about Monday. You shoulder up to the grindstone for another week and wait for Thursday to roll around again when you can start to feel the pressure lift off a bit and start thinking about the weekend. And it starts all over again.