My post office wont ship if the label says a diffrent date. I found this out the hard wat last time I sold things on the board. I took things down to get prices and he printed labels and put them on. When I went to walk out he aske me where I was going with all the packages.(small town one trafic light ,three parking places at the post office etc) I told him I would bring them bach when I recieved the money. He said it had to go out that day. Must be a pretty strict rulle cause my Postmaster is a happy go lucky guy that wouldn't do that if he didn't have to.