Apr 12, 2018 03:21 PM|PatriceSc|LINK
What if you open the Excel file and make sure date columns are using the default date format (or even a number format to see the actual underlying value for each date).
Make 100% sure the source data is ok. If this particular cell comes as null it is necessarily some formating issue on this particular cell (this is the first one in this column that couldn't be a MM/DD/YYYY date ? could it be part of the problem ?)