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Date Validation using JavaScript

Posted by Praveen Kumar on February 23, 2008

There are 6 function

function isInteger(s){  
function stripCharsInBag(s, bag){
function daysInFebruary (year){
function DaysArray(n) {
function isDate(dtStr){
function ValidateForm(){

<html>
<head>
<script language = “Javascript”>
// 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
}
function ValidateForm(){
 var dt=document.frmSample.txtDate
 if (isDate(dt.value)==false){
  dt.focus()
  return false
 }
    return true
 }
</script>
</head>
<body>
<form name=”frmSample” method=”post” action=”” onSubmit=”return ValidateForm()”>
                <p>Enter a Date <font color=”#CC0000″><b>(mm/dd/yyyy)</b></font>
                  :
                  <input type=”text” name=”txtDate” maxlength=”10″ size=”15″>
                </p>
                <p>
                  <input type=”submit” name=”Submit” value=”Submit”>
                </p>
              </form>
</body>
</html>

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2 Responses to “Date Validation using JavaScript”

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  2. Hi, yeah this post is truly fastidious and I have learned lot of things from it about blogging.

    thanks.

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