diff --git a/src/Util/DateTimeFormat.php b/src/Util/DateTimeFormat.php
index bbdf2d2c65..df7b6d92c4 100644
--- a/src/Util/DateTimeFormat.php
+++ b/src/Util/DateTimeFormat.php
@@ -182,8 +182,8 @@ class DateTimeFormat
 	 */
 	public static function fix(string $dateString): string
 	{
-		$search  = ['Mär', 'März', 'Mai', 'Juni', 'Juli', 'Okt', 'Dez', 'ET' , 'ZZ', ' - ', '+', ' (Coordinated Universal Time)'];
-		$replace = ['Mar', 'Mar' , 'May', 'Jun' , 'Jul' , 'Oct', 'Dec', 'EST', 'Z' , ', ' , '+'     , ''];
+		$search  = ['Mär', 'März', 'Mai', 'Juni', 'Juli', 'Okt', 'Dez', 'ET' , 'ZZ', ' - ', '+', '+', ' (Coordinated Universal Time)'];
+		$replace = ['Mar', 'Mar' , 'May', 'Jun' , 'Jul' , 'Oct', 'Dec', 'EST', 'Z' , ', ' , '+'     , '+'        , ''];
 
 		$dateString = str_replace($search, $replace, $dateString);
 
diff --git a/tests/src/Util/DateTimeFormatTest.php b/tests/src/Util/DateTimeFormatTest.php
index 82a294dd6e..c4e2127bad 100644
--- a/tests/src/Util/DateTimeFormatTest.php
+++ b/tests/src/Util/DateTimeFormatTest.php
@@ -130,6 +130,10 @@ class DateTimeFormatTest extends MockedTest
 			'(Coordinated Universal Time)' => [
 				'expectedDate' => '2022-12-30T14:29:10+00:00',
 				'dateString' => 'Fri Dec 30 2022 14:29:10 GMT+0000 (Coordinated Universal Time)',
+			],
+			'Double HTML encode' => [
+				'expectedDate' => '2015-05-22T08:48:00+12:00',
+				'dateString' => '2015-05-22T08:48:00+12:00'
 			]
 		];
 	}