/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year

var dtCh= "/";
var minDay=7;
var minMonth=11;
var minYear=2009;
var maxYear=2100;
var curDate=new Date(minYear,minMonth,minDay,0,0,0);

function isInteger(s){
    var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
    var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
    // February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
    for (var i = 1; i <= n; i++) {
        this[i] = 31
        if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
        if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
    var daysInMonth = DaysArray(12)
    var pos1=dtStr.indexOf(dtCh)
    var pos2=dtStr.indexOf(dtCh,pos1+1)
    var strMonth=dtStr.substring(0,pos1)
    var strDay=dtStr.substring(pos1+1,pos2)
    var strYear=dtStr.substring(pos2+1)
    strYr=strYear
    if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
    if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
    for (var i = 1; i <= 3; i++) {
        if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
    }
    month=parseInt(strMonth)
    day=parseInt(strDay)
    year=parseInt(strYr)
    if (pos1==-1 || pos2==-1){
        alert("The date format should be : mm/dd/yyyy")
        return false
    }
    if (strMonth.length<1 || month<1 || month>12){
        alert("Please enter a valid month")
        return false
    }
    if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
        alert("Please enter a valid day")
        return false
    }
    if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
        alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
        return false
    }
	// create date for submitted value
	var newDate=new Date(year,month,day,0,0,0);
    // make sure they have a date later than today
    if (curDate.getTime() > newDate.getTime()){
        alert("Please enter a valid date later than today, "+minMonth+"/"+minDay+"/"+minYear+".")
        return false
    }
    if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
        alert("Please enter a valid date")
        return false
    }
return true
}

function ValidateDate(){
    var dt=document.formname.date_arrival;
    if (isDate(dt.value)==false){
        dt.focus()
        return false
    }
    return true
 }
function tripInfo()
{
    // is there an arrival date
    if(document.formname.date_arrival.value=='')
        {
            alert("Please select your Check In Date.");
            return false;
        }
    // is it a valid future date?
    else
        {
            val=ValidateDate(document.formname.date_arrival);
            // if date is invalid
            if(val==false)
                return false;
        }
    // is there an departure date
    if(document.formname.date_departure.value=='')
        {
            alert("Please select your Check Out Date.");
            return false;
        }
	// is it the default 'mm/dd/yyyy' string
	else if(document.formname.date_departure.value.indexOf("yyyy") > 0)
	{
		alert("Please select your Check Out Date.");
		return false;
	}
    // is it a valid future date?
    else
        {
            val=ValidateDate(document.formname.date_departure);
            // if date is invalid
            if(val==false)
                return false;
        }
    // convert dates to milliseconds for calculations
    var a_d=new Date(document.formname.date_arrival.value);
    var d_d=new Date(document.formname.date_departure.value);
    a=a_d.getTime();
    b=d_d.getTime();
    // is the arrival date later than the departure date?
    if(a >= b)
    {
        alert("Please choose a Check In date prior to your Check Out date.");
        return false;
    }
    // are the dates more than 90 days apart?
    // 90 days=7776000000 ms
    if((b-a)>7776000000)
    {
        alert("You have indicated a stay of over 3 months, please check your dates.");
        return false;
    }
}