Flip Flop Days

I like the option to move a day forward or backward. But, when I do this, it moves one day into the next week. I was trying to basically flip flop a Monday and Tuesday in the same week. So, my Friday got moved into the next week's Monday when I moved Monday forward. I would like to be able to simply flip flop (I can't think of a better term right now) one day with another in the same week without having to move anything forwards or backwards.