Assigning wrong date to a photo is the second worst thing you can do to your 365 project (the first one is to give up). This is a way of cheating, but keep in mind that it's mostly cheating yourself. There are no big consequences on tookapic. Here two minor ones.
If you bend time:
- You will get less points and therefore will have less chance to climb in our user rankings
- Your photos will not be allowed in weekly themes