Sample: dhtmlxCalendar onClick event handler dhtmlxCalendar main page
X

You can set an onclick event handler

 
 
<script>
 
mCal.attachEvent("onClick",mSelectDate);
function mSelectDate(date) {
    document.getElementById('mCalInput').innerHTML = mCal.getFormatedDate("%d.%m.%Y", date);
    return true;
}
</script>
attachEvent method sets function called when specified event occurs.
In case of onclick event a function incoming argument is the date of clicked day in the calendar.