Parse Date in JS

var x = new Date(Date.parse("Jun 28 2012"));
 It will return :-
                     Wed Jun 27 2012 00:00:00 GMT+0530


And  var x = new Date(Date.parse("Jun 28 2012 14:00:00"));
 It will return :-
                     Wed Jun 28 2012 14:00:00 GMT+0530