// ******************************************************
// Check if string is a number
// ******************************************************
// Verifie si le format est un nombre
function IsNumeric (str) {
  p       = ',';
  valeur  = str.replace(p, '\.');
  return Number(valeur);
}

// ******************************************************
// Checks if the given string (DateString) is a well
// formatted date string or not
// ******************************************************
// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

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 Check_Date(dtStr){
  if (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)
    }

    now=new Date();
    month=parseInt(strMonth);
    day=parseInt(strDay);
    year=parseInt(strYr);

    if (pos1==-1 || pos2==-1){
      return false
    }
    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 == 2){
      if ((2000 + year) > now.getYear ()) {
        strYear = "19" + strYear;
        year = 1900 + year;
      }
      else {
        strYear = "20" + strYear;
        year = 2000 + year;
      }
    }
    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
  }
}