how to import dates properly so you can sort on them in a view?

I am importing data into nodes using node import module. One field I am importing, and need to sort on, is a date field. It recognizes the field and I have tried both using the import INTO field of:
Node: Created On
Node: Create New Revision

It imports and I can not sort on either.

During the import process, it displays "2007/10/31" and when it displays is a view it displays, "10/31/2007" so I assume it's recognizing the date format but it does not sort on it.

Now the sort options in View creation are not the same fields given in import. They might be the same but they are not named the same. For ex., there is Node: Created Time, which is a time stamp of, I am guessing, the time the node was imported.

Do I need to create a CCK date field? If so, then add what do I do for new manually added, using drupal rather than import, to sort?

Any ideas?