I am programming a dynamic javascript calendar on which events can be added by two persons, the manager and the associate. But, only the text box with the mentioned date appears on the browser. 
Is there a mistake in the logic?
Please help!

```
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
.calendarMonth{
border-collapse:collapse;
background-color:#eef;
}
.calendarMonth th{
}
.calendarMonth .calendarTitle{
background-color:#ddf;
}
.calendarMonth .calendarPrevious{
background-color:#ddf;
}
.calendarMonth .calendarNext{
background-color:#ddf;
}
.calendarEmpty{
}
.calendarDay{
background:#fff;
border:1px solid black;
text-align:center;
width:2em;
}
</style>

<script type="text/javascript">
var  daysInMonth=[31,28,31,30,31,30,31,31,30,31,30,31];
var  monthNames=['January','February','March','April','May','June','July','August','September','October','November','December'];

// Returns the number of days in the month in a given year (January=0)
function getDaysInMonth(month,year){
if ((month==1)&&(year%4==0)&&((year%100!=0)||(year%400==0))){
return 29;
}else{
return daysInMonth[month];
}
}

// Performs an action when a date is clicked
function dateClicked(day,month,year){
document.forms.calendar.date.value = day+'/'+month+'/'+year;  

}

// Sets the displayed month
function setDisplayedMonth(month){
if (month<0){
alert('You have reached the beginning of this calendar');
}else if (month>=months){
alert('You have reached the end of this calendar');
}else{
for (var i=0;i<months;i++){
document.getElementById('calendarMonth'+i).style.display='none';
}
document.getElementById('calendarMonth'+month).style.display='block';
}
}
</script>
</head> 

<body>
<form id="calendar">
<table>
<tr>
<td><label for="date">Date:</label></td>
<td><input type="text" id="date" name="date" value="28/05/2015"></td>
</tr>
<tr><td></td><td>
<script type="text/javascript">
var month=0;
var year=2015;
var months=12;
for (var i=0;i<months;i++){
document.writeln('<table class="calendarMonth" '+'id="calendarMonth'+i+'" cellspacing="0">');
 document.writeln('<tr>'
          +'<th class="calendarPrevious" onClick="setDisplayedMonth('+(i-1)+')"><</th>'+'<th class="calendarTitle" colspan="5">'            +monthNames[month]+' '+year+'</th>'+'<th class="calendarNext" onClick="setDisplayedMonth('+(i+1)+')">></th>'+'</tr>');

document.writeln('<tr><th>Sun</th><th>Mon</th><th>Tue</th>'+'<th>Wed</th><th>Thu</th><th>Fri</th><th>Sat</th></tr>');
var firstDayDate=new Date(year,month,1);
var firstDay=firstDayDate.getDay();
for (j=0;j<42;j++){
if (j%7==0) document.write('<tr>')
if ((j=firstDay+getDaysInMonth(month,year))){
document.write('<td class="calendarEmpty"></td>');
}else{
document.write('<td class="calendarDay" '+'onClick="dateClicked('+(j-firstDay+1)+','+(month+1)+','+year+')">'+(j-firstDay+1)+'');
}
if (j%7==6) document.write('</tr>');
}
document.writeln('</table>');
month++;
if (month>=12){
month=0;
year++;
}
}
setDisplayedMonth(5);
</script>
</td></tr>
</table>
</form>
</body>
</html>

```

Also, how can I highlight the date selected by a manager on the associate calendar?