function sendBooking(hotel, from, to) {
  var fromDate = new Date.parse($(from).val());
  var toDate = new Date.parse($(to).val());
  var oneDay=1000*60*60*24;

  var url = 'https://bookings.oxfordhotelsandinns.com/hotel-details&hotel_id=%&arrival_date=%&no_of_nights=%&rooms=%';
  var hotelId = $(hotel).val();
  var arrivalDate = fromDate.toString('d-MM-yyyy');
  var departDate = toDate.toString('d-MM-yyyy');

  if (hotelId.length > 0) {
    if (isDate(arrivalDate)) {
      if (isDate(departDate)) {
        var noOfNights = (Math.ceil(toDate.getTime() - fromDate.getTime())/oneDay);
        var rooms = 1;
        if (noOfNights > 7) {
          alert('Please note, the total number of days cannot exceed 7.');
        } else if (noOfNights < 1) {
          alert('Min stay is 1 day.');
        } else {
          window.location = 'https://bookings.oxfordhotelsandinns.com/hotel-details&hotel_id=' + hotelId + '&arrival_date=' + arrivalDate + '&no_of_nights=' + noOfNights + '&rooms=' + rooms;
        }
      } else {
        alert('Departure date is not a valid date.');
      }
    } else {
      alert('Arrival date is not a valid date.');
    }
  } else {
    alert('Please select a hotel.');
  }
  return false;  
}


function updateDateSelectBoxes(date, dayElement, monthElement, yearElement) {
  dayElement.val(date.toString('dd'));
  monthElement.val(date.toString('MM'));
  yearElement.val(date.toString('yyyy'));
}



/**** DATE VALIDATION ****/

var dtCh= "-";
var minYear=1900;
var maxYear=2100;

function isInteger(s){
  var i;
  for (i = 0; i < s.length; i++){   
    var c = s.charAt(i);
    if (((c < "0") || (c > "9"))) return false;
  }
  return true;
}

function stripCharsInBag(s, bag){
  var i;
  var 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){
  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 strDay = dtStr.substring(0,pos1)
  var strMonth = 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 (strMonth.length<1 || month<1 || month>12){
    return false
  }
  if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
    return false
  }
  if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
    return false
  }
  if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
    return false
  }
  return true
}