//Check Date Format.
function checkdate(txtcheckindate) {
    var validformat = /^\d{2}\/\d{2}\/\d{4}$/ //Basic check for format validity
    var returncheckin = false;
    //var returncheckout = false;
    if (!validformat.test(txtcheckindate.value))
        alert("Invalid Date Format. Please correct format is MM/dd/YYYY.")
    else { //Detailed check for valid date ranges
        var monthfield = txtcheckindate.value.split("/")[0]
        var dayfield = txtcheckindate.value.split("/")[1]
        var yearfield = txtcheckindate.value.split("/")[2]
        var dayobj = new Date(yearfield, monthfield - 1, dayfield)
        if ((dayobj.getMonth() + 1 != monthfield) || (dayobj.getDate() != dayfield) || (dayobj.getFullYear() != yearfield))
            alert("Invalid Day, Month, or Year range detected. Please correct checkin date.")
        else
            returncheckin = true

        var NoofNight = document.getElementById("ddlNights");
        var Night = NoofNight.options[NoofNight.selectedIndex].text

        var SetcheckOutDate = new Date(monthfield + "/" + eval(eval(dayfield) + eval(Night)) + "/" + yearfield);

        var day = SetcheckOutDate.getDate();
        var month = SetcheckOutDate.getMonth()+ 1;
        var year = SetcheckOutDate.getFullYear();
        var FinalCheckoutdate = month + "/" + day + "/" + year;

        document.getElementById("hdcheckoutdate").value = FinalCheckoutdate;
    }
    if (returncheckin == false) {
        txtcheckindate.select()
        return returncheckin;
    }
    //return returncheckin

//    if (!validformat.test(txtcheckoutdate.value))
//        alert("Invalid Date Format. Please correct format is MM/dd/YYYY.")
//    else { //Detailed check for valid date ranges
//        var monthfield = txtcheckoutdate.value.split("/")[0]
//        var dayfield = txtcheckoutdate.value.split("/")[1]
//        var yearfield = txtcheckoutdate.value.split("/")[2]
//        var dayobj = new Date(yearfield, monthfield - 1, dayfield)
//        if ((dayobj.getMonth() + 1 != monthfield) || (dayobj.getDate() != dayfield) || (dayobj.getFullYear() != yearfield))
//            alert("Invalid Day, Month, or Year range detected. Please correct checkout date.")
//        else
//            returncheckout = true;
//    }
//    if (returncheckout == false) {
//        txtcheckoutdate.select()
//        return returncheckout;
//    }

    var checkinDate = new Date(txtcheckindate.value);
    var checkoutDate = FinalCheckoutdate;    
    var currentDate = new Date();
    var diffCheckInOut;
    var diffCurrentCheckINOUT;

    //Check Current Date And Check In Date.
    diffCurrentCheckINOUT = Math.floor((checkinDate.getTime() - currentDate.getTime()) / 1000 * 60 * 60 * 24)
    if (diffCurrentCheckINOUT <= 0) {
        alert("Check In Date must be greater than Current Date");
        return false;
    }
    //Check CheckIn Date And CheckOut Date
//    diffCheckInOut = Math.floor((checkoutDate.getTime() - checkinDate.getTime()) / 1000 * 60 * 60 * 24)
//    if (diffCheckInOut <= 0) {
//        alert("Check Out Date must be greater than Check In Date");
//        return false;
//    }
//    //Check Positive No for Adults
//    if (!chkPositiveNum(document.form1.txtadult, "Adults")) {
//        return false;
//    }
//    //Check Positive No for Children
//    if (!chkPositiveNum(document.form1.txtChildren, "Children")) {
//        return false;
//    }

    return true;
}

//function chkPositiveNum(obj, fieldtitle) {
//    if (chkNum(obj, fieldtitle)) {
//        if (eval(obj.value) < 0) {
//            alert("Please enter Positive Integer.")
//            obj.select();
//            return false;
//        }
//        return true;
//    }
//    return false;
//}

//function chkNum(obj, fieldtitle) {
//    obj.value = alltrim(obj.value);
//    var str = obj.value;
//    if (str.length == 0) {
//        alert("Please Enter " + fieldtitle + ".");
//        obj.select();
//        return false;
//    }
//    var exp = new RegExp("[^0-9\-]");

//    if (str.match(exp)) {
//        alert("Please Enter Valid Number.");
//        obj.select();
//        return false;
//    }
//    return true;
//}

//function alltrim(str) {
//    var ch;
//    var rstr;
//    var i = 0;
//    while (true) {
//        ch = str.substring(i, i + 1);
//        if (ch != " ")
//            break;
//        i++;
//    }
//    str = str.substring(i, str.length);
//    i = str.length;
//    while (true) {
//        ch = str.substring(i, i - 1);
//        if (ch != " ")
//            break;
//        i--;
//    }
//    str = str.substring(0, i);
//    return (str);
//}