sort by date

sort by date

it has been my experience that when searching for a document , that results don't always sort properly. for instance I have a document type that has documents from 2014 to present . when I search in that document type and sort by date , it sorts everything from 2014 doesn't matter ascending or decending I get either the first document in 2014 or the last document in 2014 but never the "newest" document ... any ideas ?