No he olvidado el desarrollo de mi propio calendario con manejador de eventos aún, voy en su desarrollo pero lento por el trabajo seglar. Pero ahora les informo sobre otra forma de desarrollar un calendario estándar haciendo uso de PHP, XHTML y CSS.

/* calendar */
table.calendar		{ border-left:1px solid #999; }
tr.calendar-row	{  }
td.calendar-day	{ min-height:80px; font-size:11px; position:relative; } * html div.calendar-day { height:80px; }
td.calendar-day:hover	{ background:#eceff5; }
td.calendar-day-np	{ background:#eee; min-height:80px; } * html div.calendar-day-np { height:80px; }
td.calendar-day-head { background:#ccc; font-weight:bold; text-align:center; width:120px; padding:5px; border-bottom:1px solid #999; border-top:1px solid #999; border-right:1px solid #999; }
div.day-number		{ background:#999; padding:5px; color:#fff; font-weight:bold; float:right; margin:-5px -5px 0 0; width:20px; text-align:center; }
/* shared */
td.calendar-day, td.calendar-day-np { width:120px; padding:5px; border-bottom:1px solid #999; border-right:1px solid #999; }

El código en PHP:

/* draws a calendar */
function draw_calendar($month,$year){

	/* draw table */
	$calendar = '<table cellpadding="0" cellspacing="0" class="calendar">';

	/* table headings */
	$headings = array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday');
	$calendar.= '<tr class="calendar-row"><td class="calendar-day-head">'.implode('</td><td class="calendar-day-head">',$headings).'</td></tr>';

	/* days and weeks vars now ... */
	$running_day = date(w,mktime(0,0,0,$month,1,$year));
	$days_in_month = date('t',mktime(0,0,0,$month,1,$year));
	$days_in_this_week = 1;
	$day_counter = 0;
	$dates_array = array();

	/* row for week one */
	$calendar.= '<tr class="calendar-row">';

	/* print "blank" days until the first of the current week */
	for($x = 0; $x < $running_day; $x++):
		$calendar.= '<td class="calendar-day-np"> </td>';
		$days_in_this_week++;
	endfor;

	/* keep going with days.... */
	for($list_day = 1; $list_day <= $days_in_month; $list_day++):
		$calendar.= '<td class="calendar-day">';
			/* add in the day number */
			$calendar.= '<div class="day-number">'.$list_day.'</div>';

			/** QUERY THE DATABASE FOR AN ENTRY FOR THIS DAY !!  IF MATCHES FOUND, PRINT THEM !! **/
			$calendar.= str_repeat('<p> </p>',2);
			
		$calendar.= '</td>';
		if($running_day == 6):
			$calendar.= '</tr>';
			if(($day_counter+1) != $days_in_month):
				$calendar.= '<tr class="calendar-row">';
			endif;
			$running_day = -1;
			$days_in_this_week = 0;
		endif;
		$days_in_this_week++; $running_day++; $day_counter++;
	endfor;

	/* finish the rest of the days in the week */
	if($days_in_this_week < 8):
		for($x = 1; $x <= (8 - $days_in_this_week); $x++):
			$calendar.= '<td class="calendar-day-np"> </td>';
		endfor;
	endif;

	/* final row */
	$calendar.= '</tr>';

	/* end the table */
	$calendar.= '</table>';
	
	/* all done, return result */
	return $calendar;
}

/* sample usages */
echo '<h2>July 2009</h2>';
echo draw_calendar(7,2009);

echo '<h2>August 2009</h2>';
echo draw_calendar(8,2009);

Vía David Walsh blog | Demo