Serious date formating problem when retrieving with database

Hi all,

I retrieved a data from Database and I have DATE field. Excel retrieved it as STRING, even if I'm changing the formatting to date it doesn't change!
the only solution I have found is to use DATEVALUE function or simply do +0 to the field, both of these are not good for me. I must excel to understand it with formatting.

my main need is to use MIN function. for now i get 0 because it STRING.

excel problem.jpg

Thanks!