javascript检查字符串是否为有效的日期

/*----------------*/

/**
* 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 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 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
   }
   if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
       alert("Please enter a valid date")
       return false
   }
return true
}