Fix ricerca per data

src/Util/Query.php

@@ -214,7 +214,7 @@ class Query
                         $value = trim(str_replace(['<', '>'], '', $value));
 
                         if ($more || $minus) {
-                            if( date_parse($value) ){
+                            if( date_parse($value) && date_parse($value)!='1970-01-01' ){
                                 $search_filters[] = 'DATE_FORMAT('.$search_query.', "%Y-%m-%d") '.$sign.' '.prepare(date("Y-m-d",strtotime($value)));
                             }else{
                                 $search_filters[] = 'CAST('.$search_query.' AS UNSIGNED) '.$sign.' '.prepare($value);