function SBS_DateAdd(interval,number,date){
	number = parseInt(number);
	if (typeof(date)=="string"){var date = new Date(date.split("-")[0],date.split("-")[1],date.split("-")[2])}
	if (typeof(date)=="object"){var date = date}
	switch(interval){
	case "y":return new Date(date.getFullYear()+number,date.getMonth(),date.getDate()); break;
	case "m":return new Date(date.getFullYear(),date.getMonth()+number,checkDate(date.getFullYear(),date.getMonth()+number,date.getDate())); break;
	case "d":return new Date(date.getFullYear(),date.getMonth(),date.getDate()+number); break;
	case "w":return new Date(date.getFullYear(),date.getMonth(),7*number+date.getDate()); break;
	}
}
function checkDate(year,month,date){
	var enddate = ["31","28","31","30","31","30","31","31","30","31","30","31"];
	var returnDate = "";
	if (year%4==0){enddate[1]="29"}
	if (date>enddate[month]){returnDate = enddate[month]}else{returnDate = date}
	return returnDate;
}

function WeekDay(date){
	var theDate;
	if (typeof(date)=="string"){theDate = new Date(date.split("-")[0],date.split("-")[1],date.split("-")[2]);}
	if (typeof(date)=="object"){theDate = date}
	return theDate.getDay();
}
function SBS_calender(){
//	var css = document.createElement("link");
//	css.rel = "stylesheet";
//	css.type = "text/css";
//	css.href = "/Modules/CategoryForm/calenderCSS.css";
//	document.getElementsByTagName("head")[0].appendChild(css);

	var lis = "";
	var now;
	if (typeof(arguments[0])=="string"){
		selectDate = arguments[0].split("-");
		var year = selectDate[0];
		var month = parseInt(selectDate[1])-1+"";
		var date = selectDate[2];
		now = new Date(year,month,date);
	}else if (typeof(arguments[0])=="object"){
		now = arguments[0];
	}
	var lastMonthEndDate = SBS_DateAdd("d","-1",now.getFullYear()+"-"+now.getMonth()+"-01").getDate();
	var lastMonthDate = WeekDay(now.getFullYear()+"-"+now.getMonth()+"-01");
	var thisMonthLastDate = SBS_DateAdd("d","-1",now.getFullYear()+"-"+(parseInt(now.getMonth())+1).toString()+"-01");
	var thisMonthEndDate = thisMonthLastDate.getDate();
	var thisMonthEndDay = thisMonthLastDate.getDay();
	var today = new Date();
	var todayClass = "";
	today = today.getFullYear()+"-"+today.getMonth()+"-"+today.getDate();
	for (i=0; i<lastMonthDate; i++){  // Last Month's Date
		lis = "<li class='lastMonthDate'>"+lastMonthEndDate+"</li>" + lis;
		lastMonthEndDate--;
	}
	for (i=1; i<=thisMonthEndDate; i++){ // Current Month's Date
		if(today == now.getFullYear()+"-"+now.getMonth()+"-"+i){
			todayClass="class='today'";
			var todayString = now.getFullYear()+"-"+(parseInt(now.getMonth())+1).toString()+"-"+i;
		}else{
		    todayClass="";
		}
		lis += "<li "+todayClass+"><a href=javascript:void(0) onclick='innerBackDate(this)' title='"+now.getFullYear()+"-"+(parseInt(now.getMonth())+1)+"-"+i+"'>"+i+"</a></li>";
	}
	var j=1;
	for (i=thisMonthEndDay; i<6; i++){  // Next Month's Date
		lis += "<li class='nextMonthDate'>"+j+"</li>";
		j++;
	}

	var CalenderTitle = "<a href='javascript:void(0)' class='NextMonth' onclick=SBS_calender(SBS_DateAdd('m',1,'"+now.getFullYear()+"-"+now.getMonth()+"-"+now.getDate()+"'),this)>&#134;</a>";
	CalenderTitle += "<a href='javascript:void(0)' class='LastMonth' onclick=SBS_calender(SBS_DateAdd('m',-1,'"+now.getFullYear()+"-"+now.getMonth()+"-"+now.getDate()+"'),this)>&#133;</a>";
	CalenderTitle += "<span class='selectThisYear'><a href='javascript:void(0)' onclick='CalenderselectYear(this)' title='Click here to select other year' >"+now.getFullYear()+"</a></span>年<span class='selectThisMonth'><a href='javascript:void(0)' onclick='CalenderselectMonth(this)' title='Click here to select other month'>"+(parseInt(now.getMonth())+1).toString()+"</a></span>月";

	if (arguments.length>1){
		arguments[1].parentNode.parentNode.getElementsByTagName("ul")[1].innerHTML = lis;
		arguments[1].parentNode.innerHTML = CalenderTitle;

	}else{
		var CalenderBox = "<div class='calender'><div class='calenderTitle'>"+CalenderTitle+"</div><div class='calenderBody'><ul class='day'><li>日</li><li>一</li><li>二</li><li>三</li><li>四</li></li>五</li><li>六</li></ul><ul class='date'>"+lis+"</ul></div><div class='calenderBottom'><a href=javascript:void(0) onclick=this.parentNode.parentNode.style.display='none' class='closeCalenderBox' title='close'>x</a><span><span><a href=javascript:void(0) onclick='innerBackDate(this)' title='"+todayString+"'>Today</a></span></span></div></div>";
		return CalenderBox;
	}
}

function CalenderselectYear(obj){
	
		var opt = "";
		var thisYear = obj.innerHTML;
		for (i=1970; i<=2020; i++){
			if (i==thisYear){
				opt += "<option value="+i+" selected>"+i+"</option>";
			}else{
				opt += "<option value="+i+">"+i+"</option>";
			}
		}
		opt = "<select onblur='selectThisYear(this)' onchange='selectThisYear(this)' style='font-size:11px'>"+opt+"</select>";
		obj.parentNode.innerHTML = opt;
}

function selectThisYear(obj){
	SBS_calender(obj.value+"-"+obj.parentNode.parentNode.getElementsByTagName("span")[1].getElementsByTagName("a")[0].innerHTML+"-1",obj.parentNode);
}

function CalenderselectMonth(obj){
		var opt = "";
		var thisMonth = obj.innerHTML;
		for (i=1; i<=12; i++){
			if (i==thisMonth){
				opt += "<option value="+i+" selected>"+i+"</option>";
			}else{
				opt += "<option value="+i+">"+i+"</option>";
			}
		}
		opt = "<select onblur='selectThisMonth(this)' onchange='selectThisMonth(this)' >"+opt+"</select>";
		obj.parentNode.innerHTML = opt;
}
function selectThisMonth(obj){
	SBS_calender(obj.parentNode.parentNode.getElementsByTagName("span")[0].getElementsByTagName("a")[0].innerHTML+"-"+obj.value+"-1",obj.parentNode);
}

function innerBackDate(date){
	date.parentNode.parentNode.parentNode.parentNode.parentNode.parentNode.getElementsByTagName("input")[0].value = date.title;
	setTimeout(function(){Element.remove(date.parentNode.parentNode.parentNode.parentNode.parentNode)},200);
}
function SBS_setDate(inputObj){
	var calenderObj = document.createElement("div");
	calenderObj.innerHTML = SBS_calender(new Date());
	calenderObj.style.position = "absolute";
	inputObj.parentNode.appendChild(calenderObj);
}