Drupal 7 Can't add date sort criteria I have a view that display a list of nodes of a content type that has a date field.
I'm trying to add a sort criteria based on this data field, I can select it but hust after that I get returned to the main views screen, without the data sort.

I know that data fields are sortable so where can I have more informations about "why" this field is not added to sort criteria?
It will avialable in Format -> Settings -> Check 'Stortable' Check box