function isDateString(sDate)
{	var iaMonthDays = [31,28,31,30,31,30,31,31,30,31,30,31]
	var iaDate = new Array(3)
	var year, month, day

	if (arguments.length != 1) return false
	iaDate = sDate.toString().split("-")
	if (iaDate.length != 3) return false
	if (iaDate[1].length > 2 || iaDate[2].length > 2) return false
	if (isNaN(iaDate[0])||isNaN(iaDate[1])||isNaN(iaDate[2])) return false

	year = parseFloat(iaDate[0])
	month = parseFloat(iaDate[1])
	day=parseFloat(iaDate[2])

	if (year < 1900 || year > 2100) return false
	if (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0)) iaMonthDays[1]=29;
	if (month < 1 || month > 12) return false
	if (day < 1 || day > iaMonthDays[month - 1]) return false
	return true
}

function stringToDate(sDate, bIgnore)
{	var bValidDate, year, month, day
	var iaDate = new Array(3)
	
	if (bIgnore) bValidDate = true
	else bValidDate = isDateString(sDate)
	
	if (bValidDate)
	{  iaDate = sDate.toString().split("-")
		year = parseFloat(iaDate[0])
		month = parseFloat(iaDate[1]) - 1
		day=parseFloat(iaDate[2])
		return (new Date(year,month,day))
	}
	else return (new Date(1900,1,1))
}

// JavaScript Document
function setCheckInDate(d)
{
    document.getElementById("StartDate").value=d;
    if(document.getElementById("DepDate").value.length==0)
    {
        showCalendar('imageCalendar2',false,'DepDate','StartDate');
    }
}
function setCheckInDate2(d)
{
    document.getElementById("StartDate2").value=d;
    if(document.getElementById("DepDate2").value.length==0)
    {
        showCalendar('imageCalendar2',false,'DepDate2','StartDate2');
    }
}
function setCheckInDateCorp(d)
{
    document.getElementById("corp_StartDate").value=d;
    if(document.getElementById("corp_DepDate").value.length==0)
    {
        showCalendar('imageCalendar2',false,'corp_DepDate','corp_StartDate');
    }
}
<!--//
function compareDate(strDate1,strDate2) {
    var tmp1=strDate1.split('-');
    var tmp2=strDate2.split('-');
    var date1=eval('new Date('+tmp1[0]+','+tmp1[1]+','+tmp1[2]+')');
    var date2=eval('new Date('+tmp2[0]+','+tmp2[1]+','+tmp2[2]+')');
    if ((date2.valueOf()-date1.valueOf())>=25*24*60*60*1000)
    {
        return true;
    }
    else
    {
        return false;
    }
}
function compareDate1(strDate1,strDate2) {
    var tmp1=strDate1.split('-');
    var tmp2=strDate2.split('-');
    var date1=eval('new Date('+tmp1[0]+','+tmp1[1]+','+tmp1[2]+')');
    var date2=eval('new Date('+tmp2[0]+','+tmp2[1]+','+tmp2[2]+')');
    if ((date2.valueOf()-date1.valueOf())>=60*24*60*60*1000)
    {
        return true;
    }
    else
    {
        return false;
    }
}
//-->