I think those dates mean only that the schools have your name, address and e-mail.
Plus, when I called to inquire why 5 of my schools didn't have dates, they said "don't worry about it, we've transmitted to them even though there's no date." Huh? But lo and behold I was contacted by those schools, in some cases before the schools with dates. Isn't this fun trying to figure out what the
**** is going on by the stange hieroglyphics on our AMCAS apps? I think we should all get anthropology credit!