Change database from mysql 4 to mysql 5 affects my calendar event page

[newphpcoder]

I changed my database from mysql 4.1.10 to mysql 5.0 and I encountered error in my calendar event page. The output of my calendar date was change instead of date it becomes “>” and also when I press the button to move to another month I can’t move to another month. I have no idea why it happened.
Here is the old calendar code:

<?php
	$dbCnx = @mysql_connect("localhost","", "") or die('Could not Connect to the database')
	mysql_select_db("mydb");	
?>
<html>
<script>
function goLastMonth(month, year){
if(month == 1){
--year;
month = 13;
}
document.location.href = '<?=$_SERVER['PHP_SELF'];?>?month='+(month-1)+'&year='+year;
}
function goNextMonth(month, year){
if(month == 12){
++year;
month = 0;
}
document.location.href = '<?=$_SERVER['PHP_SELF'];?>?month='+(month+1)+'&year='+year;
} 
function remChars(txtControl, txtCount, intMaxLength)
{
if(txtControl.value.length > intMaxLength)
txtControl.value = txtControl.value.substring(0, (intMaxLength-1));
else
txtCount.value = intMaxLength - txtControl.value.length;
}
function checkFilled() {
var filled = 0
var x = document.form1.calName.value;
if (x.length > 0) {filled ++}
var y = document.form1.calDesc.value;
if (y.length > 0) {filled ++}
if (filled == 2) {
document.getElementById("Submit").disabled = false;
}
else {document.getElementById("Submit").disabled = true} // in case a field is filled then erased
}
</script>
<body>
<?php
$day = (isset($_GET["day"])) ? $_GET['day'] : "";
$month = (isset($_GET["month"])) ? $_GET['month'] : "";
$year = (isset($_GET["year"])) ? $_GET['year'] : "";
if(empty($day)){ $day = date("j"); }
if(empty($month)){ $month = date("n"); }
if(empty($year)){ $year = date("Y"); } 
$currentTimeStamp = strtotime("$year-$month-$day");
$monthName = date("F", $currentTimeStamp);
$numDays = date("t", $currentTimeStamp);
$counter = 0;
function hiLightEvt($eMonth,$eDay,$eYear){
$todaysDate = date("n/j/Y");
$dateToCompare = $eMonth . '/' . $eDay . '/' . $eYear;
if($todaysDate == $dateToCompare){
$aClass='class="today"';
}else{
$sql="select count(calDate) as eCount from calTbl where calDate = '" . $eMonth . '/' . $eDay . '/' . $eYear . "'";
$result = mysql_query($sql);
while($row= mysql_fetch_array($result)){
if($row['eCount'] >=1){
$aClass = 'class="event"';
}elseif($row['eCount'] ==0){
$aClass ='class="normal"';
}
}
}
return $aClass;
}
?>
<div id="Calendar_Event">
<table width="350" cellpadding="0" cellspacing="0">
<tr>
<td width="50" colspan="1">
<input type="button" value=" < " onClick="goLastMonth(<?php echo $month . ", " . $year; ?>);">
</td>
<td width="250" colspan="5">
<span class="title" style="color:#FFFFFF"><?php echo $monthName . " " . $year; ?></span><br>
</td>
<td width="50" colspan="1" align="right">
<input type="button" value=" > " onClick="goNextMonth(<?php echo $month . ", " . $year; ?>);">
</td>
</tr> 
<tr>
<th>M</td>
<th>T</td>
<th>W</td>
<th>T</td>
<th>F</td>
<th>S</td>
<th>S</td>
</tr>
<tr>
<?php
for($i = 1; $i < $numDays+1; $i++, $counter++){
$dateToCompare = $month . '/' . $i . '/' . $year;
$timeStamp = strtotime("$year-$month-$i");
if($i == 1){
$firstDay = date("N", $timeStamp);
for($j = 1; $j < $firstDay; $j++, $counter++){
echo "<td>&nbsp;</td>";
} 
}
if($counter % 7 == 0 ){
?>
</tr><tr>
<?php
}
?>
<!--right here--><td width="50" <?=hiLightEvt($month,$i,$year);?>><a href="<?=$_SERVER['PHP_SELF'] . '?month='. $month . '&day=' . $i . '&year=' . $year;?>&v=1"><?=$i;?></a></td> 
<?php
}
?>
</table>
</div>
<div id="New_Event">
<?php
if(isset($_GET['v'])){
if(isset($_POST['Submit'])){
$sql="insert into calTbl(calName,calDesc,calDate,calStamp) values('" . $_POST['calName'] ."','" . $_POST['calDesc'] . "','" . $_POST['calDate'] . "',now())";
mysql_query($sql);
}
$sql="select calName,calDesc, DATE_FORMAT(calStamp, '%a %b %e %Y') as calStamp from calTbl where calDate = '" . $month . '/' . $day . '/' . $year . "'";
$result = mysql_query($sql);
$numRows = mysql_num_rows($result);
if ($_SESSION['username']=="user1") 
{ 
$check1=mysql_query("SELECT * FROM tbllogin WHERE Username='user1' AND Department='Staff' AND Permission='True'"); 
$check2 = mysql_fetch_array($check1); 
$username = $check2['Username']; 
$dep = $check2['Department']; 
$permiss = $check2['Permission']; 
if($username=="user1" && $dep=="Staff" && $permiss=="True"){ 
$_SESSION['isallowed'] = $check2['Permission']; 
?> 
<a href="<?=$_SERVER['PHP_SELF'];?>?month=<?=$_GET['month'] . '&day=' . $_GET['day'] . '&year=' . $_GET['year'];?>&v=1&f=true">Add Even</a><a href="<?=$_SERVER['PHP_SELF'];?>?month=<?=$_GET['month'] . '&day=' . $_GET['day'] . '&year=' . $_GET['year'];?>&v=1&f=true">t</a>
<?php  
} 
}
else 
{ echo "You cannot Add New Event"; } 
?>
</div>
<div id="Cal_Event">
<?php
if(isset($_GET['f'])){
include 'calform.php';
}
if($numRows == 0 ){
echo '';
}else{
echo '<h3>Event Listed</h3>';
while($row = mysql_fetch_array($result)){
?>
<h5><?=$row['calName'];?></h5>
<?=$row['calDesc'];?><br/>
Listed On: <?=$row['calStamp'];?>
<?php
}
}
}
?>
</div>
</body>
</html>

On my new codes I only change the codes for the connection of database like the “host”, ”username” , ”password” , ”database name”, “table name”.
Honestly, I have no idea why it happened after I change my database. Actually my tbluser was work so I connected in my database on my other webpage.
Any help is highly appreciated. Thank you in advance.

[Dormilich]

what datatype is the `calDate` field in the new DB?