This might seem counter intuitive, but providing the date of origination is considered as optional. We provide it to examiners to make their job easier. During their integrity exam they utilize the unique identification number of the loan, or the note associated to its loan file, and validate the "origination date" of a loan which is when a deal is considered legal. For some banks, the signature is not the legal binding completion of the deal, but when the deal has been recorded on the books, or when the customer has received and begin benefiting from their funds.
This is an important thing to monitor as a colleague at my previous employer got caught up in a situation that our department practice where we denied any loans that came into our reports after the last day of February. We reported a loan for CD, but it had been previously denied because it fell into our denial window. We essentially failed our entire data integrity exam because of one loan out of 2800 CD loans. The industry currently seems to really shy away from resubmission, but our examiners demanded that we re-file no matter the circumstance. Though interestingly if we had planned for the situation--we could have just denied the CD loan, and no one would of known any better.