I have errors preventing me from netfiling, all the dates are missing for T5008 entries downloaded from CRA, there are hundreds of them, is there an easy fix?

Unfortunately, there is probably no easy way of doing this. You can try to sum the book value and proceeding amount into 2 periods using google sheet or excel(Period 1 - Transactions before June 24 and Period 2 - Transactions post that date) and use the total amount. 

Thanks anyway