/*
 フッターの創立年度を自動更新するために利用
*/

function since(year, month, day){
	var sin = new Date(year, month-1, day);
	var now = new Date();
	var year = 0;
	if(now.getMonth() < sin.getMonth()){
		year = now.getFullYear() - sin.getFullYear() - 1;
	}else if(now.getMonth() > sin.getMonth()){
		year = now.getFullYear() - sin.getFullYear();
	}else if(now.getDate() < sin.getDate()){
		year = now.getFullYear() - sin.getFullYear() - 1;
	}else{
		year = now.getFullYear() - sin.getFullYear();
	}
	if(year < 1){
		year = 37;	
	}
	document.write(year);
}