diff --git a/apps/dav/composer/composer/autoload_classmap.php b/apps/dav/composer/composer/autoload_classmap.php
index 7891cad42ebef..ef28133ed06d7 100644
--- a/apps/dav/composer/composer/autoload_classmap.php
+++ b/apps/dav/composer/composer/autoload_classmap.php
@@ -18,6 +18,7 @@
     'OCA\\DAV\\BackgroundJob\\CleanupInvitationTokenJob' => $baseDir . '/../lib/BackgroundJob/CleanupInvitationTokenJob.php',
     'OCA\\DAV\\BackgroundJob\\EventReminderJob' => $baseDir . '/../lib/BackgroundJob/EventReminderJob.php',
     'OCA\\DAV\\BackgroundJob\\GenerateBirthdayCalendarBackgroundJob' => $baseDir . '/../lib/BackgroundJob/GenerateBirthdayCalendarBackgroundJob.php',
+    'OCA\\DAV\\BackgroundJob\\OutOfOfficeEventDispatcherJob' => $baseDir . '/../lib/BackgroundJob/OutOfOfficeEventDispatcherJob.php',
     'OCA\\DAV\\BackgroundJob\\PruneOutdatedSyncTokensJob' => $baseDir . '/../lib/BackgroundJob/PruneOutdatedSyncTokensJob.php',
     'OCA\\DAV\\BackgroundJob\\RefreshWebcalJob' => $baseDir . '/../lib/BackgroundJob/RefreshWebcalJob.php',
     'OCA\\DAV\\BackgroundJob\\RegisterRegenerateBirthdayCalendars' => $baseDir . '/../lib/BackgroundJob/RegisterRegenerateBirthdayCalendars.php',
@@ -100,6 +101,7 @@
     'OCA\\DAV\\CalDAV\\Search\\Xml\\Request\\CalendarSearchReport' => $baseDir . '/../lib/CalDAV/Search/Xml/Request/CalendarSearchReport.php',
     'OCA\\DAV\\CalDAV\\Status\\Status' => $baseDir . '/../lib/CalDAV/Status/Status.php',
     'OCA\\DAV\\CalDAV\\Status\\StatusService' => $baseDir . '/../lib/CalDAV/Status/StatusService.php',
+    'OCA\\DAV\\CalDAV\\TimezoneService' => $baseDir . '/../lib/CalDAV/TimezoneService.php',
     'OCA\\DAV\\CalDAV\\Trashbin\\DeletedCalendarObject' => $baseDir . '/../lib/CalDAV/Trashbin/DeletedCalendarObject.php',
     'OCA\\DAV\\CalDAV\\Trashbin\\DeletedCalendarObjectsCollection' => $baseDir . '/../lib/CalDAV/Trashbin/DeletedCalendarObjectsCollection.php',
     'OCA\\DAV\\CalDAV\\Trashbin\\Plugin' => $baseDir . '/../lib/CalDAV/Trashbin/Plugin.php',
@@ -210,6 +212,8 @@
     'OCA\\DAV\\Db\\AbsenceMapper' => $baseDir . '/../lib/Db/AbsenceMapper.php',
     'OCA\\DAV\\Db\\Direct' => $baseDir . '/../lib/Db/Direct.php',
     'OCA\\DAV\\Db\\DirectMapper' => $baseDir . '/../lib/Db/DirectMapper.php',
+    'OCA\\DAV\\Db\\Property' => $baseDir . '/../lib/Db/Property.php',
+    'OCA\\DAV\\Db\\PropertyMapper' => $baseDir . '/../lib/Db/PropertyMapper.php',
     'OCA\\DAV\\Direct\\DirectFile' => $baseDir . '/../lib/Direct/DirectFile.php',
     'OCA\\DAV\\Direct\\DirectHome' => $baseDir . '/../lib/Direct/DirectHome.php',
     'OCA\\DAV\\Direct\\Server' => $baseDir . '/../lib/Direct/Server.php',
diff --git a/apps/dav/composer/composer/autoload_static.php b/apps/dav/composer/composer/autoload_static.php
index fdfe7feb6d908..73e680ef2e897 100644
--- a/apps/dav/composer/composer/autoload_static.php
+++ b/apps/dav/composer/composer/autoload_static.php
@@ -33,6 +33,7 @@ class ComposerStaticInitDAV
         'OCA\\DAV\\BackgroundJob\\CleanupInvitationTokenJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/CleanupInvitationTokenJob.php',
         'OCA\\DAV\\BackgroundJob\\EventReminderJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/EventReminderJob.php',
         'OCA\\DAV\\BackgroundJob\\GenerateBirthdayCalendarBackgroundJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/GenerateBirthdayCalendarBackgroundJob.php',
+        'OCA\\DAV\\BackgroundJob\\OutOfOfficeEventDispatcherJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/OutOfOfficeEventDispatcherJob.php',
         'OCA\\DAV\\BackgroundJob\\PruneOutdatedSyncTokensJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/PruneOutdatedSyncTokensJob.php',
         'OCA\\DAV\\BackgroundJob\\RefreshWebcalJob' => __DIR__ . '/..' . '/../lib/BackgroundJob/RefreshWebcalJob.php',
         'OCA\\DAV\\BackgroundJob\\RegisterRegenerateBirthdayCalendars' => __DIR__ . '/..' . '/../lib/BackgroundJob/RegisterRegenerateBirthdayCalendars.php',
@@ -115,6 +116,7 @@ class ComposerStaticInitDAV
         'OCA\\DAV\\CalDAV\\Search\\Xml\\Request\\CalendarSearchReport' => __DIR__ . '/..' . '/../lib/CalDAV/Search/Xml/Request/CalendarSearchReport.php',
         'OCA\\DAV\\CalDAV\\Status\\Status' => __DIR__ . '/..' . '/../lib/CalDAV/Status/Status.php',
         'OCA\\DAV\\CalDAV\\Status\\StatusService' => __DIR__ . '/..' . '/../lib/CalDAV/Status/StatusService.php',
+        'OCA\\DAV\\CalDAV\\TimezoneService' => __DIR__ . '/..' . '/../lib/CalDAV/TimezoneService.php',
         'OCA\\DAV\\CalDAV\\Trashbin\\DeletedCalendarObject' => __DIR__ . '/..' . '/../lib/CalDAV/Trashbin/DeletedCalendarObject.php',
         'OCA\\DAV\\CalDAV\\Trashbin\\DeletedCalendarObjectsCollection' => __DIR__ . '/..' . '/../lib/CalDAV/Trashbin/DeletedCalendarObjectsCollection.php',
         'OCA\\DAV\\CalDAV\\Trashbin\\Plugin' => __DIR__ . '/..' . '/../lib/CalDAV/Trashbin/Plugin.php',
@@ -225,6 +227,8 @@ class ComposerStaticInitDAV
         'OCA\\DAV\\Db\\AbsenceMapper' => __DIR__ . '/..' . '/../lib/Db/AbsenceMapper.php',
         'OCA\\DAV\\Db\\Direct' => __DIR__ . '/..' . '/../lib/Db/Direct.php',
         'OCA\\DAV\\Db\\DirectMapper' => __DIR__ . '/..' . '/../lib/Db/DirectMapper.php',
+        'OCA\\DAV\\Db\\Property' => __DIR__ . '/..' . '/../lib/Db/Property.php',
+        'OCA\\DAV\\Db\\PropertyMapper' => __DIR__ . '/..' . '/../lib/Db/PropertyMapper.php',
         'OCA\\DAV\\Direct\\DirectFile' => __DIR__ . '/..' . '/../lib/Direct/DirectFile.php',
         'OCA\\DAV\\Direct\\DirectHome' => __DIR__ . '/..' . '/../lib/Direct/DirectHome.php',
         'OCA\\DAV\\Direct\\Server' => __DIR__ . '/..' . '/../lib/Direct/Server.php',
diff --git a/apps/dav/lib/BackgroundJob/OutOfOfficeEventDispatcherJob.php b/apps/dav/lib/BackgroundJob/OutOfOfficeEventDispatcherJob.php
new file mode 100644
index 0000000000000..9b219cf30da0e
--- /dev/null
+++ b/apps/dav/lib/BackgroundJob/OutOfOfficeEventDispatcherJob.php
@@ -0,0 +1,92 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2023 Richard Steinmetz <richard@steinmetz.cloud>
+ *
+ * @author Richard Steinmetz <richard@steinmetz.cloud>
+ *
+ * @license AGPL-3.0-or-later
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\DAV\BackgroundJob;
+
+use OCA\DAV\CalDAV\TimezoneService;
+use OCA\DAV\Db\AbsenceMapper;
+use OCP\AppFramework\Db\DoesNotExistException;
+use OCP\AppFramework\Utility\ITimeFactory;
+use OCP\BackgroundJob\QueuedJob;
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\IUserManager;
+use OCP\User\Events\OutOfOfficeEndedEvent;
+use OCP\User\Events\OutOfOfficeStartedEvent;
+use Psr\Log\LoggerInterface;
+
+class OutOfOfficeEventDispatcherJob extends QueuedJob {
+	public const EVENT_START = 'start';
+	public const EVENT_END = 'end';
+
+	public function __construct(
+		ITimeFactory $time,
+		private AbsenceMapper $absenceMapper,
+		private LoggerInterface $logger,
+		private IEventDispatcher $eventDispatcher,
+		private IUserManager $userManager,
+		private TimezoneService $timezoneService,
+	) {
+		parent::__construct($time);
+	}
+
+	public function run($argument): void {
+		$id = $argument['id'];
+		$event = $argument['event'];
+
+		try {
+			$absence = $this->absenceMapper->findById($id);
+		} catch (DoesNotExistException | \OCP\DB\Exception $e) {
+			$this->logger->error('Failed to dispatch out-of-office event: ' . $e->getMessage(), [
+				'exception' => $e,
+				'argument' => $argument,
+			]);
+			return;
+		}
+
+		$userId = $absence->getUserId();
+		$user = $this->userManager->get($userId);
+		if ($user === null) {
+			$this->logger->error("Failed to dispatch out-of-office event: User $userId does not exist", [
+				'argument' => $argument,
+			]);
+			return;
+		}
+
+		$data = $absence->toOutOufOfficeData(
+			$user,
+			$this->timezoneService->getUserTimezone($userId) ?? $this->timezoneService->getDefaultTimezone(),
+		);
+		if ($event === self::EVENT_START) {
+			$this->eventDispatcher->dispatchTyped(new OutOfOfficeStartedEvent($data));
+		} elseif ($event === self::EVENT_END) {
+			$this->eventDispatcher->dispatchTyped(new OutOfOfficeEndedEvent($data));
+		} else {
+			$this->logger->error("Invalid out-of-office event: $event", [
+				'argument' => $argument,
+			]);
+		}
+	}
+}
diff --git a/apps/dav/lib/CalDAV/TimezoneService.php b/apps/dav/lib/CalDAV/TimezoneService.php
new file mode 100644
index 0000000000000..bdbd0b9fe2cb5
--- /dev/null
+++ b/apps/dav/lib/CalDAV/TimezoneService.php
@@ -0,0 +1,98 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * @copyright 2023 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2023 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\DAV\CalDAV;
+
+use OCA\DAV\Db\PropertyMapper;
+use OCP\Calendar\ICalendar;
+use OCP\Calendar\IManager;
+use OCP\IConfig;
+use Sabre\VObject\Component\VCalendar;
+use Sabre\VObject\Component\VTimeZone;
+use Sabre\VObject\Reader;
+use function array_reduce;
+
+class TimezoneService {
+
+	public function __construct(private IConfig $config,
+		private PropertyMapper $propertyMapper,
+		private IManager $calendarManager) {
+	}
+
+	public function getUserTimezone(string $userId): ?string {
+		$availabilityPropPath = 'calendars/' . $userId . '/inbox';
+		$availabilityProp = '{' . Plugin::NS_CALDAV . '}calendar-availability';
+		$availabilities = $this->propertyMapper->findPropertyByPathAndName($userId, $availabilityPropPath, $availabilityProp);
+		if (!empty($availabilities)) {
+			$availability = $availabilities[0]->getPropertyvalue();
+			/** @var VCalendar $vCalendar */
+			$vCalendar = Reader::read($availability);
+			/** @var VTimeZone $vTimezone */
+			$vTimezone = $vCalendar->VTIMEZONE;
+			// Sabre has a fallback to date_default_timezone_get
+			return $vTimezone->getTimeZone()->getName();
+		}
+
+		$principal = 'principals/users/' . $userId;
+		$uri = $this->config->getUserValue($userId, 'dav', 'defaultCalendar', CalDavBackend::PERSONAL_CALENDAR_URI);
+		$calendars = $this->calendarManager->getCalendarsForPrincipal($principal);
+
+		/** @var ?VTimeZone $personalCalendarTimezone */
+		$personalCalendarTimezone = array_reduce($calendars, function (?VTimeZone $acc, ICalendar $calendar) use ($uri) {
+			if ($acc !== null) {
+				return $acc;
+			}
+			if ($calendar->getUri() === $uri && !$calendar->isDeleted() && $calendar instanceof CalendarImpl) {
+				return $calendar->getSchedulingTimezone();
+			}
+			return null;
+		});
+		if ($personalCalendarTimezone !== null) {
+			return $personalCalendarTimezone->getTimeZone()->getName();
+		}
+
+		// No timezone in the personalCalendarTimezone calendar or no personalCalendarTimezone calendar
+		// Loop through all calendars until we find a timezone.
+		/** @var ?VTimeZone $firstTimezone */
+		$firstTimezone = array_reduce($calendars, function (?VTimeZone $acc, ICalendar $calendar) {
+			if ($acc !== null) {
+				return $acc;
+			}
+			if (!$calendar->isDeleted() && $calendar instanceof CalendarImpl) {
+				return $calendar->getSchedulingTimezone();
+			}
+			return null;
+		});
+		if ($firstTimezone !== null) {
+			return $firstTimezone->getTimeZone()->getName();
+		}
+		return null;
+	}
+
+	public function getDefaultTimezone(): string {
+		return $this->config->getSystemValueString('default_timezone', 'UTC');
+	}
+
+}
diff --git a/apps/dav/lib/Controller/AvailabilitySettingsController.php b/apps/dav/lib/Controller/AvailabilitySettingsController.php
index 3ff89fe87eb66..3e10162dd842d 100644
--- a/apps/dav/lib/Controller/AvailabilitySettingsController.php
+++ b/apps/dav/lib/Controller/AvailabilitySettingsController.php
@@ -35,11 +35,12 @@
 use OCP\AppFramework\Http\JSONResponse;
 use OCP\AppFramework\Http\Response;
 use OCP\IRequest;
+use OCP\IUserSession;
 
 class AvailabilitySettingsController extends Controller {
 	public function __construct(
 		IRequest $request,
-		private ?string $userId,
+		private ?IUserSession $userSession,
 		private AbsenceService $absenceService,
 	) {
 		parent::__construct(Application::APP_ID, $request);
@@ -56,8 +57,8 @@ public function updateAbsence(
 		string $status,
 		string $message,
 	): Response {
-		$userId = $this->userId;
-		if ($userId === null) {
+		$user = $this->userSession?->getUser();
+		if ($user === null) {
 			return new JSONResponse([], Http::STATUS_FORBIDDEN);
 		}
 
@@ -68,7 +69,7 @@ public function updateAbsence(
 		}
 
 		$absence = $this->absenceService->createOrUpdateAbsence(
-			$userId,
+			$user,
 			$firstDay,
 			$lastDay,
 			$status,
@@ -82,12 +83,12 @@ public function updateAbsence(
 	 */
 	#[NoAdminRequired]
 	public function clearAbsence(): Response {
-		$userId = $this->userId;
-		if ($userId === null) {
+		$user = $this->userSession?->getUser();
+		if ($user === null) {
 			return new JSONResponse([], Http::STATUS_FORBIDDEN);
 		}
 
-		$this->absenceService->clearAbsence($userId);
+		$this->absenceService->clearAbsence($user);
 		return new JSONResponse([]);
 	}
 
diff --git a/apps/dav/lib/Db/Absence.php b/apps/dav/lib/Db/Absence.php
index 8de8ecc9aa07e..3cd8037d57e4e 100644
--- a/apps/dav/lib/Db/Absence.php
+++ b/apps/dav/lib/Db/Absence.php
@@ -26,7 +26,8 @@
 
 namespace OCA\DAV\Db;
 
-use DateTimeImmutable;
+use DateTime;
+use DateTimeZone;
 use Exception;
 use InvalidArgumentException;
 use JsonSerializable;
@@ -67,7 +68,7 @@ public function __construct() {
 		$this->addType('message', 'string');
 	}
 
-	public function toOutOufOfficeData(IUser $user): IOutOfOfficeData {
+	public function toOutOufOfficeData(IUser $user, string $timezone): IOutOfOfficeData {
 		if ($user->getUID() !== $this->getUserId()) {
 			throw new InvalidArgumentException("The user doesn't match the user id of this absence! Expected " . $this->getUserId() . ", got " . $user->getUID());
 		}
@@ -75,8 +76,10 @@ public function toOutOufOfficeData(IUser $user): IOutOfOfficeData {
 			throw new Exception('Creating out-of-office data without ID');
 		}
 
-		$startDate = new DateTimeImmutable($this->getFirstDay());
-		$endDate = new DateTimeImmutable($this->getLastDay());
+		$tz = new DateTimeZone($timezone);
+		$startDate = new DateTime($this->getFirstDay(), $tz);
+		$endDate = new DateTime($this->getLastDay(), $tz);
+		$endDate->setTime(23, 59);
 		return new OutOfOfficeData(
 			(string)$this->getId(),
 			$user,
diff --git a/apps/dav/lib/Db/AbsenceMapper.php b/apps/dav/lib/Db/AbsenceMapper.php
index 6e1133f779c33..7529d04cf1040 100644
--- a/apps/dav/lib/Db/AbsenceMapper.php
+++ b/apps/dav/lib/Db/AbsenceMapper.php
@@ -40,6 +40,31 @@ public function __construct(IDBConnection $db) {
 		parent::__construct($db, 'dav_absence', Absence::class);
 	}
 
+	/**
+	 * @throws DoesNotExistException
+	 * @throws \OCP\DB\Exception
+	 */
+	public function findById(int $id): Absence {
+		$qb = $this->db->getQueryBuilder();
+		$qb->select('*')
+			->from($this->getTableName())
+			->where($qb->expr()->eq(
+				'id',
+				$qb->createNamedParameter($id, IQueryBuilder::PARAM_INT),
+				IQueryBuilder::PARAM_INT),
+			);
+		try {
+			return $this->findEntity($qb);
+		} catch (MultipleObjectsReturnedException $e) {
+			// Won't happen as id is the primary key
+			throw new \RuntimeException(
+				'The impossible has happened! The query returned multiple absence settings for one user.',
+				0,
+				$e,
+			);
+		}
+	}
+
 	/**
 	 * @throws DoesNotExistException
 	 * @throws \OCP\DB\Exception
diff --git a/apps/dav/lib/Db/Property.php b/apps/dav/lib/Db/Property.php
new file mode 100644
index 0000000000000..5234ad852b1a7
--- /dev/null
+++ b/apps/dav/lib/Db/Property.php
@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * @copyright 2023 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2023 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\DAV\Db;
+
+use OCP\AppFramework\Db\Entity;
+
+/**
+ * @method string getUserid()
+ * @method string getPropertypath()
+ * @method string getPropertyname()
+ * @method string getPropertyvalue()
+ */
+class Property extends Entity {
+
+	/** @var string|null */
+	protected $userid;
+
+	/** @var string|null */
+	protected $propertypath;
+
+	/** @var string|null */
+	protected $propertyname;
+
+	/** @var string|null */
+	protected $propertyvalue;
+
+	/** @var int|null */
+	protected $valuetype;
+
+}
diff --git a/apps/dav/lib/Db/PropertyMapper.php b/apps/dav/lib/Db/PropertyMapper.php
new file mode 100644
index 0000000000000..6f39d03d1c147
--- /dev/null
+++ b/apps/dav/lib/Db/PropertyMapper.php
@@ -0,0 +1,57 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * @copyright 2023 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2023 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\DAV\Db;
+
+use OCP\AppFramework\Db\QBMapper;
+use OCP\IDBConnection;
+
+/**
+ * @template-extends QBMapper<Property>
+ */
+class PropertyMapper extends QBMapper {
+
+	private const TABLE_NAME = 'properties';
+
+	public function __construct(IDBConnection $db) {
+		parent::__construct($db, self::TABLE_NAME, Property::class);
+	}
+
+	/**
+	 * @return Property[]
+	 */
+	public function findPropertyByPathAndName(string $userId, string $path, string $name): array {
+		$selectQb = $this->db->getQueryBuilder();
+		$selectQb->select('*')
+			->from(self::TABLE_NAME)
+			->where(
+				$selectQb->expr()->eq('userid', $selectQb->createNamedParameter($userId)),
+				$selectQb->expr()->eq('propertypath', $selectQb->createNamedParameter($path)),
+				$selectQb->expr()->eq('propertyname', $selectQb->createNamedParameter($name)),
+			);
+		return $this->findEntities($selectQb);
+	}
+
+}
diff --git a/apps/dav/lib/Service/AbsenceService.php b/apps/dav/lib/Service/AbsenceService.php
index b50dd32e925fd..3f5168e386d8e 100644
--- a/apps/dav/lib/Service/AbsenceService.php
+++ b/apps/dav/lib/Service/AbsenceService.php
@@ -27,11 +27,14 @@
 namespace OCA\DAV\Service;
 
 use InvalidArgumentException;
+use OCA\DAV\BackgroundJob\OutOfOfficeEventDispatcherJob;
+use OCA\DAV\CalDAV\TimezoneService;
 use OCA\DAV\Db\Absence;
 use OCA\DAV\Db\AbsenceMapper;
 use OCP\AppFramework\Db\DoesNotExistException;
+use OCP\BackgroundJob\IJobList;
 use OCP\EventDispatcher\IEventDispatcher;
-use OCP\IUserManager;
+use OCP\IUser;
 use OCP\User\Events\OutOfOfficeChangedEvent;
 use OCP\User\Events\OutOfOfficeClearedEvent;
 use OCP\User\Events\OutOfOfficeScheduledEvent;
@@ -40,7 +43,8 @@ class AbsenceService {
 	public function __construct(
 		private AbsenceMapper $absenceMapper,
 		private IEventDispatcher $eventDispatcher,
-		private IUserManager $userManager,
+		private IJobList $jobList,
+		private TimezoneService $timezoneService,
 	) {
 	}
 
@@ -52,61 +56,76 @@ public function __construct(
 	 * @throws InvalidArgumentException If no user with the given user id exists.
 	 */
 	public function createOrUpdateAbsence(
-		string $userId,
+		IUser $user,
 		string $firstDay,
 		string $lastDay,
 		string $status,
 		string $message,
 	): Absence {
 		try {
-			$absence = $this->absenceMapper->findByUserId($userId);
+			$absence = $this->absenceMapper->findByUserId($user->getUID());
 		} catch (DoesNotExistException) {
 			$absence = new Absence();
 		}
 
-		$absence->setUserId($userId);
+		$absence->setUserId($user->getUID());
 		$absence->setFirstDay($firstDay);
 		$absence->setLastDay($lastDay);
 		$absence->setStatus($status);
 		$absence->setMessage($message);
 
-		// TODO: this method should probably just take a IUser instance
-		$user = $this->userManager->get($userId);
-		if ($user === null) {
-			throw new InvalidArgumentException("User $userId does not exist");
-		}
-
 		if ($absence->getId() === null) {
-			$persistedAbsence = $this->absenceMapper->insert($absence);
-			$this->eventDispatcher->dispatchTyped(new OutOfOfficeScheduledEvent(
-				$persistedAbsence->toOutOufOfficeData($user)
-			));
-			return $persistedAbsence;
+			$absence = $this->absenceMapper->insert($absence);
+			$eventData = $absence->toOutOufOfficeData(
+				$user,
+				$this->timezoneService->getUserTimezone($user->getUID()) ?? $this->timezoneService->getDefaultTimezone(),
+			);
+			$this->eventDispatcher->dispatchTyped(new OutOfOfficeScheduledEvent($eventData));
+		} else {
+			$absence = $this->absenceMapper->update($absence);
+			$eventData = $absence->toOutOufOfficeData(
+				$user,
+				$this->timezoneService->getUserTimezone($user->getUID()) ?? $this->timezoneService->getDefaultTimezone(),
+			);
+			$this->eventDispatcher->dispatchTyped(new OutOfOfficeChangedEvent($eventData));
 		}
 
-		$this->eventDispatcher->dispatchTyped(new OutOfOfficeChangedEvent(
-			$absence->toOutOufOfficeData($user)
-		));
-		return $this->absenceMapper->update($absence);
+		$this->jobList->scheduleAfter(
+			OutOfOfficeEventDispatcherJob::class,
+			$eventData->getStartDate(),
+			[
+				'id' => $absence->getId(),
+				'event' => OutOfOfficeEventDispatcherJob::EVENT_START,
+			],
+		);
+		$this->jobList->scheduleAfter(
+			OutOfOfficeEventDispatcherJob::class,
+			$eventData->getEndDate(),
+			[
+				'id' => $absence->getId(),
+				'event' => OutOfOfficeEventDispatcherJob::EVENT_END,
+			],
+		);
+
+		return $absence;
 	}
 
 	/**
 	 * @throws \OCP\DB\Exception
 	 */
-	public function clearAbsence(string $userId): void {
+	public function clearAbsence(IUser $user): void {
 		try {
-			$absence = $this->absenceMapper->findByUserId($userId);
+			$absence = $this->absenceMapper->findByUserId($user->getUID());
 		} catch (DoesNotExistException $e) {
 			// Nothing to clear
 			return;
 		}
 		$this->absenceMapper->delete($absence);
-		// TODO: this method should probably just take a IUser instance
-		$user = $this->userManager->get($userId);
-		if ($user === null) {
-			throw new InvalidArgumentException("User $userId does not exist");
-		}
-		$eventData = $absence->toOutOufOfficeData($user);
+		$this->jobList->remove(OutOfOfficeEventDispatcherJob::class);
+		$eventData = $absence->toOutOufOfficeData(
+			$user,
+			$this->timezoneService->getUserTimezone($user->getUID()) ?? $this->timezoneService->getDefaultTimezone(),
+		);
 		$this->eventDispatcher->dispatchTyped(new OutOfOfficeClearedEvent($eventData));
 	}
 }
diff --git a/apps/dav/tests/integration/Db/PropertyMapperTest.php b/apps/dav/tests/integration/Db/PropertyMapperTest.php
new file mode 100644
index 0000000000000..e14b22654409d
--- /dev/null
+++ b/apps/dav/tests/integration/Db/PropertyMapperTest.php
@@ -0,0 +1,55 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * @copyright 2023 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2023 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\DAV\Tests\integration\Db;
+
+use OCA\DAV\Db\PropertyMapper;
+use Test\TestCase;
+
+/**
+ * @group DB
+ */
+class PropertyMapperTest extends TestCase {
+
+	/** @var PropertyMapper */
+	private PropertyMapper $mapper;
+
+	protected function setUp(): void {
+		parent::setUp();
+
+		$this->mapper = \OC::$server->get(PropertyMapper::class);
+	}
+
+	public function testFindNonExistent(): void {
+		$props = $this->mapper->findPropertyByPathAndName(
+			'userthatdoesnotexist',
+			'path/that/does/not/exist/either',
+			'nope',
+		);
+
+		self::assertEmpty($props);
+	}
+
+}
diff --git a/apps/dav/tests/unit/BackgroundJob/OutOfOfficeEventDispatcherJobTest.php b/apps/dav/tests/unit/BackgroundJob/OutOfOfficeEventDispatcherJobTest.php
new file mode 100644
index 0000000000000..ee2b69168bfba
--- /dev/null
+++ b/apps/dav/tests/unit/BackgroundJob/OutOfOfficeEventDispatcherJobTest.php
@@ -0,0 +1,175 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2023 Richard Steinmetz <richard@steinmetz.cloud>
+ *
+ * @author Richard Steinmetz <richard@steinmetz.cloud>
+ *
+ * @license AGPL-3.0-or-later
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\DAV\Tests\unit\BackgroundJob;
+
+use OCA\DAV\BackgroundJob\OutOfOfficeEventDispatcherJob;
+use OCA\DAV\CalDAV\TimezoneService;
+use OCA\DAV\Db\Absence;
+use OCA\DAV\Db\AbsenceMapper;
+use OCP\AppFramework\Utility\ITimeFactory;
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\IUser;
+use OCP\IUserManager;
+use OCP\User\Events\OutOfOfficeEndedEvent;
+use OCP\User\Events\OutOfOfficeStartedEvent;
+use PHPUnit\Framework\MockObject\MockObject;
+use Psr\Log\LoggerInterface;
+use Test\TestCase;
+
+class OutOfOfficeEventDispatcherJobTest extends TestCase {
+	private OutOfOfficeEventDispatcherJob $job;
+
+	/** @var MockObject|ITimeFactory */
+	private $timeFactory;
+
+	/** @var MockObject|AbsenceMapper */
+	private $absenceMapper;
+
+	/** @var MockObject|LoggerInterface */
+	private $logger;
+
+	/** @var MockObject|IEventDispatcher */
+	private $eventDispatcher;
+
+	/** @var MockObject|IUserManager */
+	private $userManager;
+	private MockObject|TimezoneService $timezoneService;
+
+	protected function setUp(): void {
+		parent::setUp();
+
+		$this->timeFactory = $this->createMock(ITimeFactory::class);
+		$this->absenceMapper = $this->createMock(AbsenceMapper::class);
+		$this->logger = $this->createMock(LoggerInterface::class);
+		$this->eventDispatcher = $this->createMock(IEventDispatcher::class);
+		$this->userManager = $this->createMock(IUserManager::class);
+		$this->timezoneService = $this->createMock(TimezoneService::class);
+
+		$this->job = new OutOfOfficeEventDispatcherJob(
+			$this->timeFactory,
+			$this->absenceMapper,
+			$this->logger,
+			$this->eventDispatcher,
+			$this->userManager,
+			$this->timezoneService,
+		);
+	}
+
+	public function testDispatchStartEvent() {
+		$this->timezoneService->method('getUserTimezone')->with('user')->willReturn('Europe/Berlin');
+
+		$absence = new Absence();
+		$absence->setId(200);
+		$absence->setUserId('user');
+
+		$user = $this->createMock(IUser::class);
+		$user->method('getUID')
+			->willReturn('user');
+
+		$this->absenceMapper->expects(self::once())
+			->method('findById')
+			->with(1)
+			->willReturn($absence);
+		$this->userManager->expects(self::once())
+			->method('get')
+			->with('user')
+			->willReturn($user);
+		$this->eventDispatcher->expects(self::once())
+			->method('dispatchTyped')
+			->with(self::callback(static function ($event): bool {
+				self::assertInstanceOf(OutOfOfficeStartedEvent::class, $event);
+				return true;
+			}));
+
+		$this->job->run([
+			'id' => 1,
+			'event' => OutOfOfficeEventDispatcherJob::EVENT_START,
+		]);
+	}
+
+	public function testDispatchStopEvent() {
+		$this->timezoneService->method('getUserTimezone')->with('user')->willReturn('Europe/Berlin');
+
+		$absence = new Absence();
+		$absence->setId(200);
+		$absence->setUserId('user');
+
+		$user = $this->createMock(IUser::class);
+		$user->method('getUID')
+			->willReturn('user');
+
+		$this->absenceMapper->expects(self::once())
+			->method('findById')
+			->with(1)
+			->willReturn($absence);
+		$this->userManager->expects(self::once())
+			->method('get')
+			->with('user')
+			->willReturn($user);
+		$this->eventDispatcher->expects(self::once())
+			->method('dispatchTyped')
+			->with(self::callback(static function ($event): bool {
+				self::assertInstanceOf(OutOfOfficeEndedEvent::class, $event);
+				return true;
+			}));
+
+		$this->job->run([
+			'id' => 1,
+			'event' => OutOfOfficeEventDispatcherJob::EVENT_END,
+		]);
+	}
+
+	public function testDoesntDispatchUnknownEvent() {
+		$this->timezoneService->method('getUserTimezone')->with('user')->willReturn('Europe/Berlin');
+
+		$absence = new Absence();
+		$absence->setId(100);
+		$absence->setUserId('user');
+
+		$user = $this->createMock(IUser::class);
+		$user->method('getUID')
+			->willReturn('user');
+
+		$this->absenceMapper->expects(self::once())
+			->method('findById')
+			->with(1)
+			->willReturn($absence);
+		$this->userManager->expects(self::once())
+			->method('get')
+			->with('user')
+			->willReturn($user);
+		$this->eventDispatcher->expects(self::never())
+			->method('dispatchTyped');
+		$this->logger->expects(self::once())
+			->method('error');
+
+		$this->job->run([
+			'id' => 1,
+			'event' => 'foobar',
+		]);
+	}
+}
diff --git a/apps/dav/tests/unit/CalDAV/TimezoneServiceTest.php b/apps/dav/tests/unit/CalDAV/TimezoneServiceTest.php
new file mode 100644
index 0000000000000..3646461dc4231
--- /dev/null
+++ b/apps/dav/tests/unit/CalDAV/TimezoneServiceTest.php
@@ -0,0 +1,161 @@
+<?php
+/*
+ * @copyright 2023 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2023 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types=1);
+
+/*
+ * @copyright 2023 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2023 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+namespace OCA\DAV\Tests\unit\CalDAV;
+
+use DateTimeZone;
+use OCA\DAV\CalDAV\CalendarImpl;
+use OCA\DAV\CalDAV\TimezoneService;
+use OCA\DAV\Db\Property;
+use OCA\DAV\Db\PropertyMapper;
+use OCP\Calendar\ICalendar;
+use OCP\Calendar\IManager;
+use OCP\IConfig;
+use PHPUnit\Framework\MockObject\MockObject;
+use Sabre\VObject\Component\VTimeZone;
+use Test\TestCase;
+
+class TimezoneServiceTest extends TestCase {
+
+	private IConfig|MockObject $config;
+	private PropertyMapper|MockObject $propertyMapper;
+	private IManager|MockObject $calendarManager;
+	private TimezoneService $service;
+
+	protected function setUp(): void {
+		parent::setUp();
+
+		$this->config = $this->createMock(IConfig::class);
+		$this->propertyMapper = $this->createMock(PropertyMapper::class);
+		$this->calendarManager = $this->createMock(IManager::class);
+
+		$this->service = new TimezoneService(
+			$this->config,
+			$this->propertyMapper,
+			$this->calendarManager,
+		);
+	}
+
+	public function testGetUserTimezoneFromAvailability(): void {
+		$property = new Property();
+		$property->setPropertyvalue('BEGIN:VCALENDAR
+PRODID:Nextcloud DAV app
+BEGIN:VTIMEZONE
+TZID:Europe/Vienna
+END:VTIMEZONE
+END:VCALENDAR');
+		$this->propertyMapper->expects(self::once())
+			->method('findPropertyByPathAndName')
+			->willReturn([
+				$property,
+			]);
+
+		$timezone = $this->service->getUserTimezone('test123');
+
+		self::assertNotNull($timezone);
+		self::assertEquals('Europe/Vienna', $timezone);
+	}
+
+	public function testGetUserTimezoneFromPersonalCalendar(): void {
+		$this->config->expects(self::once())
+			->method('getUserValue')
+			->with('test123', 'dav', 'defaultCalendar')
+			->willReturn('personal-1');
+		$other = $this->createMock(ICalendar::class);
+		$other->method('getUri')->willReturn('other');
+		$personal = $this->createMock(CalendarImpl::class);
+		$personal->method('getUri')->willReturn('personal-1');
+		$tz = new DateTimeZone('Europe/Berlin');
+		$vtz = $this->createMock(VTimeZone::class);
+		$vtz->method('getTimeZone')->willReturn($tz);
+		$personal->method('getSchedulingTimezone')->willReturn($vtz);
+		$this->calendarManager->expects(self::once())
+			->method('getCalendarsForPrincipal')
+			->with('principals/users/test123')
+			->willReturn([
+				$other,
+				$personal,
+			]);
+
+		$timezone = $this->service->getUserTimezone('test123');
+
+		self::assertNotNull($timezone);
+		self::assertEquals('Europe/Berlin', $timezone);
+	}
+
+	public function testGetUserTimezoneFromAny(): void {
+		$this->config->expects(self::once())
+			->method('getUserValue')
+			->with('test123', 'dav', 'defaultCalendar')
+			->willReturn('personal-1');
+		$other = $this->createMock(ICalendar::class);
+		$other->method('getUri')->willReturn('other');
+		$personal = $this->createMock(CalendarImpl::class);
+		$personal->method('getUri')->willReturn('personal-2');
+		$tz = new DateTimeZone('Europe/Prague');
+		$vtz = $this->createMock(VTimeZone::class);
+		$vtz->method('getTimeZone')->willReturn($tz);
+		$personal->method('getSchedulingTimezone')->willReturn($vtz);
+		$this->calendarManager->expects(self::once())
+			->method('getCalendarsForPrincipal')
+			->with('principals/users/test123')
+			->willReturn([
+				$other,
+				$personal,
+			]);
+
+		$timezone = $this->service->getUserTimezone('test123');
+
+		self::assertNotNull($timezone);
+		self::assertEquals('Europe/Prague', $timezone);
+	}
+
+	public function testGetUserTimezoneNoneFound(): void {
+		$timezone = $this->service->getUserTimezone('test123');
+
+		self::assertNull($timezone);
+	}
+
+}
diff --git a/config/config.sample.php b/config/config.sample.php
index 27b99636a2207..a1f7332c4047b 100644
--- a/config/config.sample.php
+++ b/config/config.sample.php
@@ -228,6 +228,16 @@
  */
 'force_locale' => 'en_US',
 
+/**
+ * This sets the default timezone on your Nextcloud server, using IANA
+ * identifiers like ``Europe/Berlin`` or ``Pacific/Auckland``. The default
+ * timezone parameter is only used when the timezone of the user can't be
+ * determined.
+ *
+ * Defaults to ``UTC``
+ */
+'default_timezone' => 'Europe/Berlin',
+
 /**
  * ``true`` enables the Help menu item in the user menu (top right of the
  * Nextcloud Web interface). ``false`` removes the Help item.
diff --git a/lib/composer/composer/autoload_classmap.php b/lib/composer/composer/autoload_classmap.php
index b90e2866bc6f0..78a101dcdf66c 100644
--- a/lib/composer/composer/autoload_classmap.php
+++ b/lib/composer/composer/autoload_classmap.php
@@ -742,7 +742,9 @@
     'OCP\\User\\Events\\BeforeUserLoggedOutEvent' => $baseDir . '/lib/public/User/Events/BeforeUserLoggedOutEvent.php',
     'OCP\\User\\Events\\OutOfOfficeChangedEvent' => $baseDir . '/lib/public/User/Events/OutOfOfficeChangedEvent.php',
     'OCP\\User\\Events\\OutOfOfficeClearedEvent' => $baseDir . '/lib/public/User/Events/OutOfOfficeClearedEvent.php',
+    'OCP\\User\\Events\\OutOfOfficeEndedEvent' => $baseDir . '/lib/public/User/Events/OutOfOfficeEndedEvent.php',
     'OCP\\User\\Events\\OutOfOfficeScheduledEvent' => $baseDir . '/lib/public/User/Events/OutOfOfficeScheduledEvent.php',
+    'OCP\\User\\Events\\OutOfOfficeStartedEvent' => $baseDir . '/lib/public/User/Events/OutOfOfficeStartedEvent.php',
     'OCP\\User\\Events\\PasswordUpdatedEvent' => $baseDir . '/lib/public/User/Events/PasswordUpdatedEvent.php',
     'OCP\\User\\Events\\PostLoginEvent' => $baseDir . '/lib/public/User/Events/PostLoginEvent.php',
     'OCP\\User\\Events\\UserChangedEvent' => $baseDir . '/lib/public/User/Events/UserChangedEvent.php',
diff --git a/lib/composer/composer/autoload_static.php b/lib/composer/composer/autoload_static.php
index c1c3bc25869a5..2026dfec112ad 100644
--- a/lib/composer/composer/autoload_static.php
+++ b/lib/composer/composer/autoload_static.php
@@ -775,7 +775,9 @@ class ComposerStaticInit749170dad3f5e7f9ca158f5a9f04f6a2
         'OCP\\User\\Events\\BeforeUserLoggedOutEvent' => __DIR__ . '/../../..' . '/lib/public/User/Events/BeforeUserLoggedOutEvent.php',
         'OCP\\User\\Events\\OutOfOfficeChangedEvent' => __DIR__ . '/../../..' . '/lib/public/User/Events/OutOfOfficeChangedEvent.php',
         'OCP\\User\\Events\\OutOfOfficeClearedEvent' => __DIR__ . '/../../..' . '/lib/public/User/Events/OutOfOfficeClearedEvent.php',
+        'OCP\\User\\Events\\OutOfOfficeEndedEvent' => __DIR__ . '/../../..' . '/lib/public/User/Events/OutOfOfficeEndedEvent.php',
         'OCP\\User\\Events\\OutOfOfficeScheduledEvent' => __DIR__ . '/../../..' . '/lib/public/User/Events/OutOfOfficeScheduledEvent.php',
+        'OCP\\User\\Events\\OutOfOfficeStartedEvent' => __DIR__ . '/../../..' . '/lib/public/User/Events/OutOfOfficeStartedEvent.php',
         'OCP\\User\\Events\\PasswordUpdatedEvent' => __DIR__ . '/../../..' . '/lib/public/User/Events/PasswordUpdatedEvent.php',
         'OCP\\User\\Events\\PostLoginEvent' => __DIR__ . '/../../..' . '/lib/public/User/Events/PostLoginEvent.php',
         'OCP\\User\\Events\\UserChangedEvent' => __DIR__ . '/../../..' . '/lib/public/User/Events/UserChangedEvent.php',
diff --git a/lib/private/User/AvailabilityCoordinator.php b/lib/private/User/AvailabilityCoordinator.php
index 8e6b73bd56d94..e33a0aa155844 100644
--- a/lib/private/User/AvailabilityCoordinator.php
+++ b/lib/private/User/AvailabilityCoordinator.php
@@ -28,6 +28,7 @@
 
 use JsonException;
 use OCA\DAV\AppInfo\Application;
+use OCA\DAV\CalDAV\TimezoneService;
 use OCA\DAV\Db\AbsenceMapper;
 use OCP\AppFramework\Db\DoesNotExistException;
 use OCP\ICache;
@@ -46,6 +47,7 @@ public function __construct(
 		private AbsenceMapper $absenceMapper,
 		private IConfig $config,
 		private LoggerInterface $logger,
+		private TimezoneService $timezoneService,
 	) {
 		$this->cache = $cacheFactory->createLocal('OutOfOfficeData');
 	}
@@ -115,7 +117,10 @@ public function getCurrentOutOfOfficeData(IUser $user): ?IOutOfOfficeData {
 			return null;
 		}
 
-		$data = $absenceData->toOutOufOfficeData($user);
+		$data = $absenceData->toOutOufOfficeData(
+			$user,
+			$this->timezoneService->getUserTimezone($user->getUID()) ?? $this->timezoneService->getDefaultTimezone(),
+		);
 		$this->setCachedOutOfOfficeData($data);
 		return $data;
 	}
diff --git a/lib/public/User/Events/OutOfOfficeEndedEvent.php b/lib/public/User/Events/OutOfOfficeEndedEvent.php
new file mode 100644
index 0000000000000..43a6bf77e28bd
--- /dev/null
+++ b/lib/public/User/Events/OutOfOfficeEndedEvent.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2023 Richard Steinmetz <richard@steinmetz.cloud>
+ *
+ * @author Richard Steinmetz <richard@steinmetz.cloud>
+ *
+ * @license AGPL-3.0-or-later
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\User\Events;
+
+use OCP\EventDispatcher\Event;
+use OCP\User\IOutOfOfficeData;
+
+/**
+ * Emitted when a user's out-of-office period ended
+ *
+ * @since 28.0.0
+ */
+class OutOfOfficeEndedEvent extends Event {
+	/**
+	 * @since 28.0.0
+	 */
+	public function __construct(private IOutOfOfficeData $data) {
+		parent::__construct();
+	}
+
+	/**
+	 * @since 28.0.0
+	 */
+	public function getData(): IOutOfOfficeData {
+		return $this->data;
+	}
+}
diff --git a/lib/public/User/Events/OutOfOfficeStartedEvent.php b/lib/public/User/Events/OutOfOfficeStartedEvent.php
new file mode 100644
index 0000000000000..f7816c968ddee
--- /dev/null
+++ b/lib/public/User/Events/OutOfOfficeStartedEvent.php
@@ -0,0 +1,51 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * @copyright Copyright (c) 2023 Richard Steinmetz <richard@steinmetz.cloud>
+ *
+ * @author Richard Steinmetz <richard@steinmetz.cloud>
+ *
+ * @license AGPL-3.0-or-later
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCP\User\Events;
+
+use OCP\EventDispatcher\Event;
+use OCP\User\IOutOfOfficeData;
+
+/**
+ * Emitted when a user's out-of-office period started
+ *
+ * @since 28.0.0
+ */
+class OutOfOfficeStartedEvent extends Event {
+	/**
+	 * @since 28.0.0
+	 */
+	public function __construct(private IOutOfOfficeData $data) {
+		parent::__construct();
+	}
+
+	/**
+	 * @since 28.0.0
+	 */
+	public function getData(): IOutOfOfficeData {
+		return $this->data;
+	}
+}
diff --git a/tests/lib/User/AvailabilityCoordinatorTest.php b/tests/lib/User/AvailabilityCoordinatorTest.php
index fd850fcdfd796..8a0b66181d23f 100644
--- a/tests/lib/User/AvailabilityCoordinatorTest.php
+++ b/tests/lib/User/AvailabilityCoordinatorTest.php
@@ -28,6 +28,7 @@
 
 use OC\User\AvailabilityCoordinator;
 use OC\User\OutOfOfficeData;
+use OCA\DAV\CalDAV\TimezoneService;
 use OCA\DAV\Db\Absence;
 use OCA\DAV\Db\AbsenceMapper;
 use OCP\ICache;
@@ -45,6 +46,7 @@ class AvailabilityCoordinatorTest extends TestCase {
 	private IConfig|MockObject $config;
 	private AbsenceMapper $absenceMapper;
 	private LoggerInterface $logger;
+	private MockObject|TimezoneService $timezoneService;
 
 	protected function setUp(): void {
 		parent::setUp();
@@ -54,6 +56,7 @@ protected function setUp(): void {
 		$this->absenceMapper = $this->createMock(AbsenceMapper::class);
 		$this->config = $this->createMock(IConfig::class);
 		$this->logger = $this->createMock(LoggerInterface::class);
+		$this->timezoneService = $this->createMock(TimezoneService::class);
 
 		$this->cacheFactory->expects(self::once())
 			->method('createLocal')
@@ -64,6 +67,7 @@ protected function setUp(): void {
 			$this->absenceMapper,
 			$this->config,
 			$this->logger,
+			$this->timezoneService,
 		);
 	}
 
@@ -86,6 +90,7 @@ public function testGetOutOfOfficeData(): void {
 		$absence->setLastDay('2023-10-08');
 		$absence->setStatus('Vacation');
 		$absence->setMessage('On vacation');
+		$this->timezoneService->method('getUserTimezone')->with('user')->willReturn('Europe/Berlin');
 
 		$user = $this->createMock(IUser::class);
 		$user->method('getUID')
@@ -101,13 +106,13 @@ public function testGetOutOfOfficeData(): void {
 			->willReturn($absence);
 		$this->cache->expects(self::once())
 			->method('set')
-			->with('user', '{"id":"420","startDate":1696118400,"endDate":1696723200,"shortMessage":"Vacation","message":"On vacation"}', 300);
+			->with('user', '{"id":"420","startDate":1696111200,"endDate":1696802340,"shortMessage":"Vacation","message":"On vacation"}', 300);
 
 		$expected = new OutOfOfficeData(
 			'420',
 			$user,
-			1696118400,
-			1696723200,
+			1696111200,
+			1696802340,
 			'Vacation',
 			'On vacation',
 		);
@@ -149,6 +154,7 @@ public function testGetOutOfOfficeDataWithInvalidCachedData(): void {
 		$absence->setLastDay('2023-10-08');
 		$absence->setStatus('Vacation');
 		$absence->setMessage('On vacation');
+		$this->timezoneService->method('getUserTimezone')->with('user')->willReturn('Europe/Berlin');
 
 		$user = $this->createMock(IUser::class);
 		$user->method('getUID')
@@ -164,13 +170,13 @@ public function testGetOutOfOfficeDataWithInvalidCachedData(): void {
 			->willReturn($absence);
 		$this->cache->expects(self::once())
 			->method('set')
-			->with('user', '{"id":"420","startDate":1696118400,"endDate":1696723200,"shortMessage":"Vacation","message":"On vacation"}', 300);
+			->with('user', '{"id":"420","startDate":1696111200,"endDate":1696802340,"shortMessage":"Vacation","message":"On vacation"}', 300);
 
 		$expected = new OutOfOfficeData(
 			'420',
 			$user,
-			1696118400,
-			1696723200,
+			1696111200,
+			1696802340,
 			'Vacation',
 			'On vacation',
 		);