diff --git a/src/RfcParser.php b/src/RfcParser.php
index 1081de4..b0cf9f6 100755
--- a/src/RfcParser.php
+++ b/src/RfcParser.php
@@ -221,7 +221,7 @@ static public function parseRDate($line)
 		foreach ($property['params'] as $name => $value) {
 			switch (strtoupper($name)) {
 				case 'TZID':
-					$tz = new \DateTimeZone($value);
+					$tz = self::parseTimeZone($value);
 				break;
 				case 'VALUE':
 					switch ($value) {
@@ -284,7 +284,7 @@ static public function parseExDate($line)
 					// Ignore optional words
 					break;
 				case 'TZID':
-					$tz = new \DateTimeZone($value);
+					$tz = self::parseTimeZone($value);
 				break;
 				default:
 					throw new \InvalidArgumentException("Unknown property parameter: $name");
@@ -325,4 +325,4 @@ static public function parseTimeZone($tzid)
 
 		return new \DateTimeZone($tzid);
 	}
-}
\ No newline at end of file
+}
diff --git a/tests/RfcParserTest.php b/tests/RfcParserTest.php
index e39322c..87bebea 100755
--- a/tests/RfcParserTest.php
+++ b/tests/RfcParserTest.php
@@ -79,6 +79,9 @@ public function exdateLines()
 			array('EXDATE;TZID=America/New_York:19970714T083000',
 				array(date_create('19970714T083000',new \DateTimeZone('America/New_York')))
 			),
+			array('EXDATE;TZID=W. Europe Standard Time:20230915T222222',
+				array(date_create('20230915T222222',new \DateTimeZone('Europe/Berlin')))
+			),
 		);
 	}
 
@@ -90,4 +93,4 @@ public function testParseExDate($string, $expected)
 		$dates = RfcParser::parseExDate($string);
 		$this->assertEquals($dates, $expected);
 	}
-}
\ No newline at end of file
+}