Fix syntax to be 5.3 safe

Dereferencing the new operator is only 5.4 ready.

scripts/functions.inc.php

@@ -14,10 +14,13 @@ function getCAPData()
                 $isTest = true;
             }
             
+            $pubDate = (string) $item->children('dc', true)->date;
+            $pubDateTime = new DateTime($pubDate);
+
             $output = array(
-                'identifier' => md5((string) $item->children('dc', true)->date),
+                'identifier' => md5($pubDate),
                 'sender' => 'police.unl.edu',
-                'sent' => (new DateTime((string) $item->children('dc', true)->date))->format(DateTime::ATOM),
+                'sent' => $pubDateTime->format(DateTime::ATOM),
                 'status' => $isTest ? 'Test' : 'Actual',
                 'msgType' => 'Alert',
                 'scope' => 'Public',