diff --git a/apps/dav/lib/CalDAV/BirthdayService.php b/apps/dav/lib/CalDAV/BirthdayService.php
index be6b091153888..df351a475524a 100644
--- a/apps/dav/lib/CalDAV/BirthdayService.php
+++ b/apps/dav/lib/CalDAV/BirthdayService.php
@@ -54,6 +54,8 @@
  */
 class BirthdayService {
 	public const BIRTHDAY_CALENDAR_URI = 'contact_birthdays';
+	public const EXCLUDE_FROM_BIRTHDAY_CALENDAR_PROPERTY_NAME = 'X-NC-EXCLUDE-FROM-BIRTHDAY-CALENDAR';
+
 	private GroupPrincipalBackend $principalBackend;
 	private CalDavBackend $calDavBackEnd;
 	private CardDavBackend $cardDavBackEnd;
@@ -180,6 +182,10 @@ public function buildDateFromContact(string  $cardData,
 			return null;
 		}
 
+		if (isset($doc->{self::EXCLUDE_FROM_BIRTHDAY_CALENDAR_PROPERTY_NAME})) {
+			return null;
+		}
+
 		if (!isset($doc->{$dateField})) {
 			return null;
 		}
diff --git a/apps/dav/tests/unit/CardDAV/BirthdayServiceTest.php b/apps/dav/tests/unit/CardDAV/BirthdayServiceTest.php
index 188b82843cd23..c1292cbace28f 100644
--- a/apps/dav/tests/unit/CardDAV/BirthdayServiceTest.php
+++ b/apps/dav/tests/unit/CardDAV/BirthdayServiceTest.php
@@ -438,6 +438,9 @@ public function providesVCards() {
 			['12345 (*1900)', '19701231', 'BDAY', '0', '1900', 'PT9H', "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", 'BDAY', '', false, 'PT9H'],
 			['12345 (*1900)', '19701231', 'BDAY', '0', '1900', '-PT15H', "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", 'BDAY', '', false, '-PT15H'],
 			['12345 (*1900)', '19701231', 'BDAY', '0', '1900', '-P6DT15H', "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", 'BDAY', '', false, '-P6DT15H'],
+			[null, null, null, null, null, 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:19000101\r\nX-NC-EXCLUDE-FROM-BIRTHDAY-CALENDAR;TYPE=boolean:true\r\nEND:VCARD\r\n", 'BDAY', '', true, null],
+			[null, null, null, null, null, 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\nX-NC-EXCLUDE-FROM-BIRTHDAY-CALENDAR;TYPE=boolean:true\r\nDEATHDATE:19001231\r\nEND:VCARD\r\n", 'DEATHDATE', '-death', true, null],
+			[null, null, null, null, null, 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\nANNIVERSARY:19001231\r\nX-NC-EXCLUDE-FROM-BIRTHDAY-CALENDAR;TYPE=boolean:true\r\nEND:VCARD\r\n", 'ANNIVERSARY', '-anniversary', true, null],
 		];
 	}
 }