Date validation error

[yuet_niswee]

i'm using javascript to validate the check in date and check out date...
i couldn't make the validation work... could anypne help me.. i'll be gratefull and appreciate for your help..
below is my code:
-----------------------------------------------------------------
<%@page import="java.util.*" errorPage="ErrorHandler3.jsp"%>
<SCRIPT TYPE ="text/javascript" LANGUAGE="javascript">
<!--
function validate(theForm){
var missing="";
var space =" ";
var CitySpace="";
var retval = true;

retval = checkdate(theForm.IYear.options[theForm.IYear.selectedIndex].value,theForm.IMonth.options[theForm.IMonth.selectedIndex].value, theForm.IDay.options[theForm.IDay.selectedIndex].value,theForm.OYear.options[theForm.OYear.selectedIndex].value, theForm.OMonth.options[theForm.OMonth.selectedIndex].value,theForm.ODay.options[theForm.ODay.selectedIndex].value)
if(retval == false)
{
missing += "Invalid Date format - Check In Date cannot later than Check Out Date\n";
}

if(missing != "")
{
alert("You missed the following field or some of the format :\n\n" + missing +
"\nPlease complete and resubmit.");
return false;
}
function checkdate(IYear, IMonth, IDay, OYear, OMonth, ODay)
{
var imonth, Inmonth, omonth, Outmonth;
var iday, Inday, oday, Outday;

var arrmonthNo = new Array(13);
var arrmonthChar = new Array(13);
arrmonthChar[1] = '01';
arrmonthChar[2] = '02';
arrmonthChar[3] = '03';
arrmonthChar[4] = '04';
arrmonthChar[5] = '05';
arrmonthChar[6] = '06';
arrmonthChar[7] = '07';
arrmonthChar[8] = '08';
arrmonthChar[9] = '09';
arrmonthChar[10] = '10';
arrmonthChar[11] = '11';
arrmonthChar[12] = '12';

var arrdayNo = new Array(32);
var arrdayChar[1] = '01';
var arrdayChar[2] = '02';
var arrdayChar[3] = '03';
var arrdayChar[4] = '04';
var arrdayChar[5] = '05';
var arrdayChar[6] = '06';
var arrdayChar[7] = '07';
var arrdayChar[8] = '08';
var arrdayChar[9] = '09';
var arrdayChar[10] = '10';
var arrdayChar[11] = '11';
var arrdayChar[12] = '12';
var arrdayChar[13] = '13';
var arrdayChar[14] = '14';
var arrdayChar[15] = '15';
var arrdayChar[16] = '16';
var arrdayChar[17] = '17';
var arrdayChar[18] = '18';
var arrdayChar[19] = '19';
var arrdayChar[20] = '20';
var arrdayChar[21] = '21';
var arrdayChar[22] = '22';
var arrdayChar[23] = '23';
var arrdayChar[24] = '24';
var arrdayChar[25] = '25';
var arrdayChar[26] = '26';
var arrdayChar[27] = '27';
var arrdayChar[28] = '28';
var arrdayChar[29] = '29';
var arrdayChar[30] = '30';
var arrdayChar[31] = '31';

for (i = 1; i <= 12; i++)
{
arrmonthNo = i;
}

for (i = 1; i <= 12; i++)
{
if(IMonth == arrmonthChar)
{
imonth = arrmonthNo;
Inmonth = parseInt(imonth);
}
}
for (i = 1; i <= 12; i++)
{
if(OMonth == arrmonthChar)
{
omonth = arrmonthNo;
Outmonth = parseInt(omonth);
}
}

for (i = 1; i <= 31; i++)
{
arrdayNo = i;
}

for (i = 1; i <= 31; i++)
{
if(IDay == arrdayChar)
{
iday = arrdayNo;
Inday = parseInt(iday);
}
}
for (i = 1; i <= 31; i++)
{
if(ODay == arrdayChar)
{
oday = arrdayNo;
Outday = parseInt(oday);
}
}
if(parseInt(IYear) > parseInt(OYear))
{
return(false);
}
else if((Inmonth > Outmonth) & (parseInt(IYear) > parseInt(OYear))
{
return(false);
}
else if((Inday > Outday) & (Inmonth > Outmonth) & (parseInt(IYear) > parseInt(OYear))
{
return(false);
}


}//checkdate
}

----------------------------------------------------------------------
thanks for your help

regards,
yuetNiSwee

[Charles]

There's no need to go through all of that. The Date constructor will take any number of date formats. The object will then return NaN if that date was invalid, else it can return the date in whatever format you please.

<script type="text/javascript">
<!--
Date.prototype.toString = function () {if (isNaN(this.getTime())) return NaN; return [['Sunday,', 'Monday,', 'Tuesday,', 'Wednesday,', 'Thursday,', 'Friday,', 'Saturday,'] [this.getDay()], this.getDate(), ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'] [this.getMonth()], this.getFullYear()].join('&nbsp;')}

document.write(new Date ('1/15/2003'));

// -->
</script>