WordPress StrToTime Function

There is times that I am wanting to convert a time string and have it output in the sites timezone. This is a simple function that utilizes the DateTime class and implements the wp_timezone for its output.

function wp_strtotime($str = "now" ) {
	if ($str == '' || in_array($str,array("+","-") ) ) $str = "now";

	$datetime = new DateTime($str, wp_timezone()); 
	$dt_timestamp = $datetime->format('U');

	$nowdatetime = new DateTime("now", wp_timezone());
	$now_timestamp = $nowdatetime->format('U');

	if ($now_timestamp != current_time('timestamp')) {
		$timeDiff = $now_timestamp - current_time('timestamp');
		$dt_timestamp = $dt_timestamp - $timeDiff;
	}


	return $dt_timestamp;
}