$summary $freq_type ".print_r($byday,true)."$wkst3char $the_sunday

$summary ".$byday_arr[1].$week.$on_day." st:".date("Ymd",$month_start)." t:".date("Ymd",$time)."\n";
						if($byday_arr[1] == '-') $next_date_time = strtotime($byday_arr[1].$week.$on_day,$month_end);
						else {
							# we need this special offset in case the event day coincides with the month start day
							# eg: month starts on a Sunday, our event is the Nth Sunday of the month... without this
							# special offset, the event will be added to the (N+1)th Sunday of the month
							$special_offset = ($month_start_day == $on_day) ? (24 * 60 * 60) : 0;
							$next_date_time = strtotime($byday_arr[1] . $week . $on_day, ($month_start + $special_offset));
						}
						# check that we're still in the same month
						if (date("m",$next_date_time) == date("m",$time) ) $times[] = $next_date_time;
					}
				}else{
					# byweekno should act like freq_type = week
					$next_date_time = strtotime("this $on_day",strtotime($the_sunday)) + (12 * 60 * 60);
					$times[] = $next_date_time;
				}
				break;
			default:
				$month_start = strtotime(date("Ym01",$time));
				$next_date_time = strtotime($byday_arr[1].$byday_arr[2].$on_day, $month_start);
		}
	}
	#echo "exp byday";dump_times($times);
	return $times;
}


function restrict_bymonth($times,$freq=''){
	global $bymonth, $byyearday;
	if (empty($bymonth) || !empty($byyearday)) return $times;
	$new_times=array();
	foreach ($times as $time){
		if(in_array(date("m", $time), $bymonth)) $new_times[] = $time;
	}
	return $new_times;
}
function restrict_byweekno($times,$freq=''){
	global $byweekno;
	if(empty($byweekno)) return $times;
	$new_times=array();
	foreach ($times as $time) if(in_array(date("W", $time), $byweekno)) $new_times[] = $time;
	return $new_times;

}
function restrict_byyearday($times,$freq=''){
	global $byyearday;
	if(empty($byyearday)) return $times;
	$new_times=array();
	foreach ($times as $time){
		foreach ($byyearday as $yearday){
			if($yearday < 0){
				$yearday = 365 + $yearday +1;
				if(date("L",$time)) $yearday += 1;
			}
			$yearday_arr[] = $yearday;
		}
		# date(z,$time) gives 0 for Jan 1
		if(in_array((date("z", $time)+1), $yearday_arr)) $new_times[] = $time;
	}
	return $new_times;
}

function restrict_bymonthday($times,$freq=''){
	global $bymonthday;
	if(empty($bymonthday)) return $times;
	$new_times=array();
	foreach ($times as $time){
		foreach ($bymonthday as $monthday){
			if($monthday < 0) $monthday = date("t",$time) + $monthday +1;
			$monthday_arr[] = $monthday;
		}
		if(in_array(date("j", $time), $monthday_arr)) $new_times[] = $time;
	}
	return $new_times;
}
function restrict_byday($times,$freq=''){
	global $byday;
	if(empty($byday)) return $times;
	foreach($byday as $key=>$day) {
		/* set $byday_arr
				[0] => byday string, e.g. 4TH
				[1] => sign/modifier
				[2] => 4 number
				[3] => TH day abbr
		*/
		ereg ('([-\+]{0,1})?([0-9]{1})?([A-Z]{2})', $day, $byday_arr);
		$byday3[] = two2threeCharDays($byday_arr[3]);
	}
	$new_times=array();
	foreach ($times as $time) if(in_array(strtolower(date("D", $time)), $byday3)) $new_times[] = $time;
	return $new_times;
}

function restrict_bysetpos($times,$freq=''){
	global $bysetpos;
	if(empty($bysetpos)) return $times;
	sort($times);
	$new_times=array();
	foreach($bysetpos as $setpos){
		$new_times[] = implode('',array_slice($times, $setpos, 1));
	}
	return $new_times;
}

# for diagnostics
function dump_times($times){
	global $summary;
	echo "
$summary times:";
	#var_dump($times);
	foreach($times as $time) echo "\ndate:".date("Y-m-d H:i:s",$time);
	echo "
";
}