I too have issues with students posting late for many assignments. I have found out over the years that beginning students tend to think that they may post at any time before, during and after the due. I actually had a student not to long ago ask what the "drop-dead" due day was. Of course I replied the actual due date is the due date. I then further explianed that due dates are not loose goals. The main issue with late work is that lack of quailty and missing information.