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How do you check if a date is valid?

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Old 12-10-2007, 07:34 AM
itbarota itbarota is offline
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Default How do you check if a date is valid?
Hi all...

How do you check if a date is valid?

Thanks...
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  #2 (permalink)  
Old 12-10-2007, 07:41 AM
Pvinothkumar Pvinothkumar is offline
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Default Re: How do you check if a date is valid?
Hi all...


<script language="JavaScript"><!--
function y2k(number) { return (number < 1000) ? number + 1900 : number; }

function isDate (day,month,year) {
// checks if date passed is valid
// will accept dates in following format:
// isDate(dd,mm,ccyy), or
// isDate(dd,mm) - which defaults to the current year, or
// isDate(dd) - which defaults to the current month and year.
// Note, if passed the month must be between 1 and 12, and the
// year in ccyy format.

var today = new Date();
year = ((!year) ? y2k(today.getYear()):year);
month = ((!month) ? today.getMonth():month-1);
if (!day) return false
var test = new Date(year,month,day);
if ( (y2k(test.getYear()) == year) &&
(month == test.getMonth()) &&
(day == test.getDate()) )
return true;
else
return false
}

if (isDate(31,2,1997))
document.write("Valid");
else
document.write("Invalid");
//--></script>


Thanks....
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Old 12-10-2007, 08:59 PM
sathian sathian is offline
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Default Re: How do you check if a date is valid?
Example Correct Date Formate


<form id="test_form" action="get" method="/checkdatejavascript"
onsubmit="return(check_form(this)); return false;">
<select name="dateday" id="dateday">
<option value="1">1</option>
[…]
</select>
<select name="datemonth" id="datemonth">
<option value="0">January</option>
[…]
</select>
<select name="dateyear" id="dateyear">
<option value="2006">2006</option>
[…]
</select>
</form>

function check_form()
{
var day = document.getElementById('dateday').value;
var month = document.getElementById('datemonth').value;
var year = document.getElementById('dateyear').value;

// This instruction will create a date object
source_date = new Date(year,month,day);

if(year != source_date.getFullYear())
{
alert('Year is not valid!');
return false;
}

if(month != source_date.getMonth())
{
alert('Month is not valid!');
return false;
}

if(day != source_date.getDate())
{
alert('Day is not valid!');
return false;
}

return true;
}

Thanks
Sathian.K
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Old 12-28-2007, 06:25 AM
GDevakii GDevakii is offline
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Smile Re: How do you check if a date is valid?
<html>
<head>
<script language = "Javascript">
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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Old 12-30-2007, 11:21 PM
shaalini shaalini is offline
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Posts: 342
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Default Re: How do you check if a date is valid?
function isDate(dateStr) {
var datePat = /^(\d{1,2})(\/|-)(\d{1,2})(\/|-)(\d{4})$/;
var matchArray = dateStr.match(datePat); // is the format ok?

if (matchArray == null) {
alert("Please enter your birth date as dd/mm/yyyy. Your current selection reads: " + dateStr);
return false;
}

day = matchArray[1]; // p@rse date into variables
month = matchArray[3];
year = matchArray[5];

if (month < 1 || month > 12) { // check month range
alert("Month must be between 1 and 12.");
return false;
}

if (day < 1 || day > 31) {
alert("Day must be between 1 and 31.");
return false;
}

if ((month==4 || month==6 || month==9 || month==11) && day==31) {
alert("Month "+month+" doesn`t have 31 days!");
return false;
}

if (month == 2) { // check for february 29th
var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
if (day > 29 || (day==29 && !isleap)) {
alert("February " + year + " doesn`t have " + day + " days!");
return false;
}
}
return true; // date is valid
}

function checkForValidDate(){
var ddlVMonth = document.getElementById("_ctl0_DropDownListMaanden ");
var ddlVDay = document.getElementById("_ctl0_DropDownListDagen") ;
var ddlVYear = document.getElementById("_ctl0_DropDownListJaren") ;

if (!isDate(ddlVDay.value + '/' + ddlVMonth.value + '/' + ddlVYear.value))
{ return(false); }

return(true);
}
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