According to MDN the setHours
function actually takes additional optional parameters to set both minutes, seconds and milliseconds. Hence we may simply write
// dateString is for example "Fri, 26 Sep 2014 18:30:00 GMT"
function getFormattedDate(dateString) {
var date = new Date(dateString);
date.setHours(0, 0, 0); // Set hours, minutes and seconds
return date.toString();
}