Months validation on date picker based on drop down not working

Hi Team,

my requirement is like select 1 from drop down it means January so only January should be enable on date picker , other months should be disable . if need more clarification please let me know .
below is my code please help me out where i m doing wrong.

var monthYear=0;
monthYear = $('#mYear').val();; 
		alert(mYear);
		$("#pdate").datepicker
			({
	   			minDate:"dateToday",
	   			dateFormat: 'dd/mm/yy',
	   			changeMonth: true,
	   			numberOfMonths: 1,
	   			onClose: function (selectedDate) {
	 						$("#pdate").datepicker("option", "minDate", selectedDate);
	   								},
	   							//Code to disable dates according to selection
	   							beforeShowDay: filterDate
			});
 var filterDate = function(date) {
     if(monthYear=='0'){
       return [true];
     }else{          
       return [(1+date.getMonth()) == monthYear];
     }
 }
  $(document).ready(function() {  
	 $("#sdata").click(function(evt) {
		evt.preventDefault();
		 if(save()){
			$.ajax({
				url: "Test.jsp",
				type: "post",
				data: {
				pS:$('#pS').val(),
				pType:$('#pT').val(),
				pCode:$('#pC').val(),
				mYear:$('#mYear').val(),
				pDate:$('#pdate').val(),
				ppDate:$('#ppdate').val(),
				bDate:$('#bdate').val()},
				success: function(responseFromServer) {
	            	$.each(responseFromServer, function(resultMessageKey,resultMessageValue) {	
	                    $('#content').html(resultMessageKey);
	                });
	            	getClearDateValues();
	             },
	            error: function() {
	                alert(" Ajax call Failed to Update Values into Database");
	            }
			});
		 }
		 else
			 {
			 
			 }
	});
});

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