diff --git a/lib/private/L10N/L10N.php b/lib/private/L10N/L10N.php
index 620c99dd1ec2da2e56b03eb13f83e9b415edd4e8..19db04a7cd4ac8a0d16adae54a814f23e096ef2d 100644
--- a/lib/private/L10N/L10N.php
+++ b/lib/private/L10N/L10N.php
@@ -169,6 +169,8 @@ class L10N implements IL10N {
 				return (string) Calendar::formatDatetime($value, $width, $locale);
 			case 'time':
 				return (string) Calendar::formatTime($value, $width, $locale);
+			case 'weekdayName':
+				return (string) Calendar::getWeekdayName($value, $width, $locale);
 			default:
 				return false;
 		}
diff --git a/tests/lib/L10N/L10nTest.php b/tests/lib/L10N/L10nTest.php
index 6d662efee237a04e11684751200abb78b5033b48..703aa9e227c64fa756a1670f1c33a9228ee92ced 100644
--- a/tests/lib/L10N/L10nTest.php
+++ b/tests/lib/L10N/L10nTest.php
@@ -164,4 +164,9 @@ class L10nTest extends TestCase {
 		$l = \OC::$server->getL10N('lib', 'de');
 		$this->assertEquals('de', $l->getLanguageCode());
 	}
+
+	public function testWeekdayName() {
+		$l = \OC::$server->getL10N('lib', 'de');
+		$this->assertEquals('Mo.', $l->l('weekdayName', new \DateTime('2017-11-6'), ['width' => 'abbreviated']));
+	}
 }