Adding suffix to day of a month jQuery datepicker(st,nd,rd)

adding-suffix to day of a month jQuery datepicker(st,nd,rd)

$( "#dateID" ).datepicker({
		dateFormat: 'D M d',
		onSelect: function(dateText, inst) {
			var dateArr = dateText.split(' ')
			var suffix = "";
			switch(inst.selectedDay) {
				case '1': case '21': case '31': suffix = 'st'; break;
				case '2': case '22': suffix = 'nd'; break;
				case '3': case '23': suffix = 'rd'; break;
				default: suffix = 'th';
			}
			$("input#dateID").val(dateArr[0] +' '+ dateArr[1] +' '+dateArr[2]+suffix );
		}
 });