Times pass so quickly - were all your efforts for naught? This is not necessarily the case. Depending on the program, there are possibilities for submitting the proposal even after the deadline has passed.
Sometimes the postmark is the decisive factor. Find out which post offices are open late.
If your documents can be put directly into an in-house mailbox, you should find out the exact delivery time in advance.
 The system time hack
A computer system's clock can be turned back. Usually the recipient's mail program also shows this new, manipulated time. This can be done with a bit of expertise, but it is not such a common practice.
 Handing in certain documents at a later date
You might be able to submit your main documents on time and then hand in a few specific ones at a later date. It is worth finding out about this possibility in advance.