diff --git a/apps/dav/lib/CalDAV/BirthdayService.php b/apps/dav/lib/CalDAV/BirthdayService.php
index 104eec6b49..702b74bf1b 100644
--- a/apps/dav/lib/CalDAV/BirthdayService.php
+++ b/apps/dav/lib/CalDAV/BirthdayService.php
@@ -30,6 +30,11 @@ use Exception;
 use OCA\DAV\CardDAV\CardDavBackend;
 use OCA\DAV\DAV\GroupPrincipalBackend;
 use Sabre\VObject\Component\VCalendar;
+use Sabre\VObject\Component\VCard;
+use Sabre\VObject\DateTimeParser;
+use Sabre\VObject\Document;
+use Sabre\VObject\InvalidDataException;
+use Sabre\VObject\Property\VCard\DateAndOrTime;
 use Sabre\VObject\Reader;
 
 class BirthdayService {
@@ -129,6 +134,12 @@ class BirthdayService {
 		}
 		try {
 			$doc = Reader::read($cardData);
+			// We're always converting to vCard 4.0 so we can rely on the
+			// VCardConverter handling the X-APPLE-OMIT-YEAR property for us.
+			if (!$doc instanceof VCard) {
+				return null;
+			}
+			$doc = $doc->convert(Document::VCARD40);
 		} catch (Exception $e) {
 			return null;
 		}
@@ -136,21 +147,43 @@ class BirthdayService {
 		if (!isset($doc->{$dateField})) {
 			return null;
 		}
+		if (!isset($doc->FN)) {
+			return null;
+		}
 		$birthday = $doc->{$dateField};
 		if (!(string)$birthday) {
 			return null;
 		}
-		$title = str_replace('{name}',
-			strtr((string)$doc->FN, array('\,' => ',', '\;' => ';')),
-			'{name}'
-		);
+		// Skip if the BDAY property is not of the right type.
+		if (!$birthday instanceof DateAndOrTime) {
+			return null;
+		}
+
+		// Skip if we can't parse the BDAY value.
+		try {
+			$dateParts = DateTimeParser::parseVCardDateTime($birthday->getValue());
+		} catch (InvalidDataException $e) {
+			return null;
+		}
+
+		$unknownYear = false;
+		if (!$dateParts['year']) {
+			$birthday = '1900-' . $dateParts['month'] . '-' . $dateParts['date'];
+
+			$unknownYear = true;
+		}
+
 		try {
 			$date = new \DateTime($birthday);
 		} catch (Exception $e) {
 			return null;
 		}
-
-		$summary = $title . ' (' . $summarySymbol . $date->format('Y') . ')';
+		if ($unknownYear) {
+			$summary = $doc->FN->getValue() . ' ' . $summarySymbol;
+		} else {
+			$year = (int)$date->format('Y');
+			$summary = $doc->FN->getValue() . " ($summarySymbol$year)";
+		}
 		$vCal = new VCalendar();
 		$vCal->VERSION = '2.0';
 		$vEvent = $vCal->createComponent('VEVENT');
diff --git a/apps/dav/tests/unit/CardDAV/BirthdayServiceTest.php b/apps/dav/tests/unit/CardDAV/BirthdayServiceTest.php
index 5eeb6772a6..cecf07ef1d 100644
--- a/apps/dav/tests/unit/CardDAV/BirthdayServiceTest.php
+++ b/apps/dav/tests/unit/CardDAV/BirthdayServiceTest.php
@@ -55,18 +55,18 @@ class BirthdayServiceTest extends TestCase {
 
 	/**
 	 * @dataProvider providesVCards
-	 * @param boolean $nullExpected
+	 * @param boolean $expectedSummary
 	 * @param string | null $data
 	 */
-	public function testBuildBirthdayFromContact($nullExpected, $data) {
+	public function testBuildBirthdayFromContact($expectedSummary, $data) {
 		$cal = $this->service->buildDateFromContact($data, 'BDAY', '*');
-		if ($nullExpected) {
+		if ($expectedSummary === null) {
 			$this->assertNull($cal);
 		} else {
 			$this->assertInstanceOf('Sabre\VObject\Component\VCalendar', $cal);
 			$this->assertTrue(isset($cal->VEVENT));
 			$this->assertEquals('FREQ=YEARLY', $cal->VEVENT->RRULE->getValue());
-			$this->assertEquals('12345 (*1900)', $cal->VEVENT->SUMMARY->getValue());
+			$this->assertEquals($expectedSummary, $cal->VEVENT->SUMMARY->getValue());
 			$this->assertEquals('TRANSPARENT', $cal->VEVENT->TRANSP->getValue());
 		}
 	}
@@ -233,14 +233,19 @@ class BirthdayServiceTest extends TestCase {
 
 	public function providesVCards() {
 		return [
-			[true, null],
-			[true, ''],
-			[true, 'yasfewf'],
-			[true, "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nFN:12345\r\nN:12345;;;;\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
-			[true, "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nFN:12345\r\nN:12345;;;;\r\nBDAY:\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
-			[true, "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nFN:12345\r\nN:12345;;;;\r\nBDAY:someday\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
-			[false, "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nFN:12345\r\nN:12345;;;;\r\nBDAY:1900-01-01\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
-			[false, "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nFN:12345\r\nN:12345;;;;\r\nBDAY:1900-12-31\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
+			[null, null],
+			[null, ''],
+			[null, 'yasfewf'],
+			[null, "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nFN:12345\r\nN:12345;;;;\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
+			[null, "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nFN:12345\r\nN:12345;;;;\r\nBDAY:\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
+			[null, "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nFN:12345\r\nN:12345;;;;\r\nBDAY:someday\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
+			['12345 (*1900)', "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nFN:12345\r\nN:12345;;;;\r\nBDAY:19000101\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
+			['12345 (*1900)', "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nFN:12345\r\nN:12345;;;;\r\nBDAY:19001231\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
+			['12345 *', "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nFN:12345\r\nN:12345;;;;\r\nBDAY:--1231\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
+			['12345 *', "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nFN:12345\r\nN:12345;;;;\r\nBDAY;X-APPLE-OMIT-YEAR=1604:16041231\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
+			[null, "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nFN:12345\r\nN:12345;;;;\r\nBDAY:;VALUE=text:circa 1800\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
+			[null, "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nN:12345;;;;\r\nBDAY:20031231\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
+			['12345 (*900)', "BEGIN:VCARD\r\nVERSION:3.0\r\nPRODID:-//Sabre//Sabre VObject 4.1.1//EN\r\nUID:12345\r\nFN:12345\r\nN:12345;;;;\r\nBDAY:09001231\r\nEND:VCARD\r\n", "Dr. Foo Bar"],
 		];
 	}
 }