JS--校验开始日期和结束日期

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//+--------------------------------------------------  
//| 校验开始日期和结束日期
//+--------------------------------------------------
function vali_Date()
{
	var start = $("#startDate").val();
	var end = $("#endDate").val();
	if($("#chooseDay").attr("checked") == "checked" || $('input:radio[name="conditionType"]:checked').val() == '2'){
		if(!stringIsNull(start) && !stringIsNull(end)){
			alert('请选择时间');
			$("#startDate").focus();
			return false;
		}
		else if(!stringIsNull(start)){
			alert('请选择开始时间');
			$("#startDate").focus();
			return false;
		}
		else if(!stringIsNull(end)){
			alert('请选择结束时间');
			$("#endDate").focus();
			return false;
		}
		
	}
	if(stringIsNull(start) && stringIsNull(end)){
		if(end<start){
			alert('结束时间不能小于开始时间！');
			$("#endDate").focus();
			return false;
		}
		
		var d = new Date();
		var sysdate = d.toLocaleDateString();
		sysdate = Date.parse(sysdate);//系统当前时间
		var endDate = Date.parse(end);
		if(endDate>sysdate || endDate==sysdate){
			alert('结束时间不能大于等于系统当前时间！');
			$("#endDate").focus();
			return false;
		}
		
		var days = daysBetween(start,end);
		if(days>180){
			alert('时间跨度不能超过六个月！');
			$("#endDate").focus();
			return false;
		}
	}
	return true;
}


//+--------------------------------------------------  
//| 求两个时间的天数差 日期格式为 YYYY-MM-dd   
//+--------------------------------------------------
function daysBetween(DateOne,DateTwo)  
{   
	var OneMonth = DateOne.substring(5,DateOne.lastIndexOf ('-'));  
    var OneDay = DateOne.substring(DateOne.length,DateOne.lastIndexOf ('-')+1);  
    var OneYear = DateOne.substring(0,DateOne.indexOf ('-'));  
  
    var TwoMonth = DateTwo.substring(5,DateTwo.lastIndexOf ('-'));  
    var TwoDay = DateTwo.substring(DateTwo.length,DateTwo.lastIndexOf ('-')+1);  
    var TwoYear = DateTwo.substring(0,DateTwo.indexOf ('-'));  
  
    var cha=((Date.parse(OneMonth+'/'+OneDay+'/'+OneYear)- Date.parse(TwoMonth+'/'+TwoDay+'/'+TwoYear))/86400000);   
    return Math.abs(cha);  
}