function selectDate1(){
	//2007年～現在の年まで表示
	var year = 2007;
	var year2 = 2024;
	var month = 4;
    	var date = 30;
	var intLoopCount = 0;
	var intLoopCount2 = 0;



	document.myform.year1.length = year2 - year + 2;
	document.myform.year1.options[ 0 ].text = "";

	intLoopCount2 = 1;

	for( intLoopCount = year2 ; intLoopCount >= year ; intLoopCount -- ){
	// 2007年から現在の年まで自動でoption追加

		document.myform.year1.options[ intLoopCount2 ].text = intLoopCount;

		intLoopCount2++;

	}


	if( document.myform.year1.value == year2 ){
	// 現在の年が選択されたとき

		document.myform.month1.length = month + 1;
		document.myform.month1.options[ 0 ].text = "";

		for( intLoopCount = 1 ; intLoopCount <= month ; intLoopCount++ ){

			document.myform.month1.options[ intLoopCount ].text = intLoopCount;

		}

	}else{
	// 過去データのとき

		if( document.myform.year1.value == year ){

			document.myform.month1.length = 10;
			document.myform.month1.options[ 0 ].text = "";

			intLoopCount2 = 1

			for( intLoopCount = 4 ; intLoopCount <= 12 ; intLoopCount++ ){

				document.myform.month1.options[ intLoopCount2 ].text = intLoopCount;

				intLoopCount2++;

			}

		}else{

			document.myform.month1.length = 13;
			document.myform.month1.options[ 0 ].text = "";

			for( intLoopCount = 1 ; intLoopCount <= 12 ; intLoopCount++ ){

				document.myform.month1.options[ intLoopCount ].text = intLoopCount;

			}

		}

	}

	if( document.myform.year1.value !== "" && document.myform.month1.value !== "" ){

		date = leapYearCheck( document.myform.year1.value , document.myform.month1.value ) + 1;
		document.myform.date1.length = date

		document.myform.date1.options[ 0 ].text = "";

		for( intLoopCount = 1 ; intLoopCount < date ; intLoopCount++ ){

			document.myform.date1.options[ intLoopCount ].text = intLoopCount;

		}

	}else{

		document.myform.date1.length = 32;
		document.myform.date1.options[ 0 ].text = "";

		for( intLoopCount = 1 ; intLoopCount <= date ; intLoopCount++ ){

			document.myform.date1.options[ intLoopCount ].text = intLoopCount;

		}

	}

}



function selectDate2(){
	//2007年～現在の年まで表示
	var year = 2007;
	
	var year2 = 2024;
	var month = 4;
    	var date = 30;

	var intLoopCount = 0;
	var intLoopCount2 = 0;



	document.myform.year2.length = year2 - year + 2;
	document.myform.year2.options[ 0 ].text = "";

	intLoopCount2 = 1;

	for( intLoopCount = year2 ; intLoopCount >= year ; intLoopCount -- ){
	// 2007年から現在の年まで自動でoption追加

		document.myform.year2.options[ intLoopCount2 ].text = intLoopCount;

		intLoopCount2++;

	}


	if( document.myform.year2.value == year2 ){
	// 現在の年が選択されたとき

		document.myform.month2.length = month + 1;
		document.myform.month2.options[ 0 ].text = "";

		for( intLoopCount = 1 ; intLoopCount <= month ; intLoopCount++ ){

			document.myform.month2.options[ intLoopCount ].text = intLoopCount;

		}

	}else{
	// 過去データのとき

		if( document.myform.year2.value == year ){

			document.myform.month2.length = 10;
			document.myform.month2.options[ 0 ].text = "";

			intLoopCount2 = 1

			for( intLoopCount = 4 ; intLoopCount <= 12 ; intLoopCount++ ){

				document.myform.month2.options[ intLoopCount2 ].text = intLoopCount;

				intLoopCount2++;

			}

		}else{

			document.myform.month2.length = 13;
			document.myform.month2.options[ 0 ].text = "";

			for( intLoopCount = 1 ; intLoopCount <= 12 ; intLoopCount++ ){

				document.myform.month2.options[ intLoopCount ].text = intLoopCount;

			}

		}

	}

	if( document.myform.year2.value !== "" && document.myform.month2.value !== "" ){

		date = leapYearCheck( document.myform.year2.value , document.myform.month2.value ) + 1;
		document.myform.date2.length = date

		document.myform.date2.options[ 0 ].text = "";

		for( intLoopCount = 1 ; intLoopCount < date ; intLoopCount++ ){

			document.myform.date2.options[ intLoopCount ].text = intLoopCount;

		}

	}else{

		document.myform.date2.length = 32;
		document.myform.date2.options[ 0 ].text = "";

		for( intLoopCount = 1 ; intLoopCount <= date ; intLoopCount++ ){

			document.myform.date2.options[ intLoopCount ].text = intLoopCount;

		}

	}

}

function leapYearCheck( y , m ){

	var year = 2024;
	var month = 4;
	var date = 29;
	var last = 0;
	var mDate = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)

	if( year == y && month == m ){

		last = 29;

	}else if (2 == m && (0 == y % 400 || (0 == y % 4 && 0 != y % 100))) {

		last = 29;

	} else {

		last = mDate[m - 1];
	}


	return last;

}