diff --git a/composer.lock b/composer.lock
index ac24c18..d5b99f5 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "df89229d36c9d3133b8f00872aefe73d",
+    "content-hash": "3affcf22479997bf7bae2bd6b9c0cf5e",
     "packages": [
         {
             "name": "dflydev/hawk",
@@ -893,6 +893,75 @@
             },
             "time": "2019-03-08T08:55:37+00:00"
         },
+        {
+            "name": "symfony/asset",
+            "version": "v7.2.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/asset.git",
+                "reference": "cb926cd59fefa1f9b4900b3695f0f846797ba5c0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/symfony/asset/zipball/cb926cd59fefa1f9b4900b3695f0f846797ba5c0",
+                "reference": "cb926cd59fefa1f9b4900b3695f0f846797ba5c0",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=8.2"
+            },
+            "conflict": {
+                "symfony/http-foundation": "<6.4"
+            },
+            "require-dev": {
+                "symfony/http-client": "^6.4|^7.0",
+                "symfony/http-foundation": "^6.4|^7.0",
+                "symfony/http-kernel": "^6.4|^7.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Component\\Asset\\": ""
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Fabien Potencier",
+                    "email": "fabien@symfony.com"
+                },
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                }
+            ],
+            "description": "Manages URL generation and versioning of web assets such as CSS stylesheets, JavaScript files and image files",
+            "homepage": "https://symfony.com",
+            "support": {
+                "source": "https://github.com/symfony/asset/tree/v7.2.0"
+            },
+            "funding": [
+                {
+                    "url": "https://symfony.com/sponsor",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/fabpot",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2024-10-25T15:15:23+00:00"
+        },
         {
             "name": "symfony/cache",
             "version": "v7.2.4",
diff --git a/src/Controller/CalendarController.php b/src/Controller/CalendarController.php
index 4d90e7e..fb903ee 100644
--- a/src/Controller/CalendarController.php
+++ b/src/Controller/CalendarController.php
@@ -3,6 +3,7 @@
 namespace App\Controller;
 
 use App\Service\AbsenceManager;
+use App\Service\CalendarExportService;
 use App\Service\CalendarService;
 use DateTime;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
@@ -15,6 +16,7 @@ final class CalendarController extends AbstractController
     public function __construct(
         private readonly AbsenceManager $absenceManager,
         private readonly CalendarService $calendarService,
+        private readonly CalendarExportService $calendarExportService,
         private readonly string $requiredApiKey
     ) {
     }
@@ -40,4 +42,28 @@ final class CalendarController extends AbstractController
             'days' => $days,
         ]);
     }
+    
+    #[Route('/cal', name: 'calendar_ics')]
+    public function exportCalendarIcs(Request $request): Response
+    {
+        if (!$request->query->has('key') || $request->query->get('key') !== $this->requiredApiKey) {
+            return new Response('Kein Zugriff', Response::HTTP_FORBIDDEN);
+        }
+        
+        $startDate = (new DateTime())->format('Y-m-d');
+        $endDate = (new DateTime('+180 days'))->format('Y-m-d');
+        
+        $absences = $this->absenceManager->getAbsencesForUser('tim.lappe@check24.de', new DateTime('-1 day'));
+        
+        $days = $this->calendarService->getAllDays($startDate, $endDate);
+        $days = $this->calendarService->processAbsences($days, $absences);
+        
+        $icsContent = $this->calendarExportService->generateIcsContent($days, $absences);
+        
+        $response = new Response($icsContent);
+        $response->headers->set('Content-Type', 'text/calendar; charset=utf-8');
+        $response->headers->set('Content-Disposition', 'attachment; filename="work_calendar.ics"');
+        
+        return $response;
+    }
 } 
\ No newline at end of file
diff --git a/src/Service/CalendarExportService.php b/src/Service/CalendarExportService.php
new file mode 100644
index 0000000..96a1cea
--- /dev/null
+++ b/src/Service/CalendarExportService.php
@@ -0,0 +1,107 @@
+<?php
+
+namespace App\Service;
+
+use App\Model\Absence;
+use DateTime;
+use DateTimeInterface;
+use DateTimeZone;
+
+final class CalendarExportService
+{
+    private const DUSSELDORF_ADDRESS = 'CHECK24 \nHeinricht-Heine-Allee 53\n40213 Düsseldorf\nDeutschland';
+    private const KAMEN_ADDRESS = 'Privat \nHeidkamp 21\n59174 Kamen\nDeutschland';
+    private const COMPANY_NAME = 'CHECK24';
+    private const TIMEZONE = 'Europe/Berlin';
+
+    public function generateIcsContent(array $days, array $absences): string
+    {
+        $icsContent = [
+            'BEGIN:VCALENDAR',
+            'VERSION:2.0',
+            'PRODID:-//CHECK24//Work Calendar//EN',
+            'CALSCALE:GREGORIAN',
+            'METHOD:PUBLISH',
+            $this->generateTimezone(),
+        ];
+
+        foreach ($days as $day) {
+            if ($this->isWeekend($day) || ($day['isUrlaub'] ?? false)) {
+                continue;
+            }
+
+            $eventStart = clone $day['date'];
+            $eventStart->setTime(9, 0, 0);
+            
+            $eventEnd = clone $day['date'];
+            $eventEnd->setTime(17, 30, 0);
+            
+            $isHomeOffice = $day['isFtk'] ?? false;
+            $location = $isHomeOffice ? self::KAMEN_ADDRESS : self::DUSSELDORF_ADDRESS;
+
+            $name = match ($isHomeOffice) {
+                true => 'CHECK24 🏠',
+                false => 'CHECK24 🏢',
+            };
+            
+            $icsContent[] = 'BEGIN:VEVENT';
+            $icsContent[] = 'UID:' . $this->generateUid($eventStart);
+            $icsContent[] = 'DTSTAMP:' . $this->formatDateTime(new DateTime('now', new DateTimeZone(self::TIMEZONE)));
+            $icsContent[] = 'DTSTART;TZID=' . self::TIMEZONE . ':' . $this->formatDateTimeLocal($eventStart);
+            $icsContent[] = 'DTEND;TZID=' . self::TIMEZONE . ':' . $this->formatDateTimeLocal($eventEnd);
+            $icsContent[] = 'SUMMARY:' . $name;
+            $icsContent[] = 'LOCATION:' . $location;
+            $icsContent[] = 'END:VEVENT';
+        }
+
+        $icsContent[] = 'END:VCALENDAR';
+
+        return implode("\r\n", $icsContent);
+    }
+
+    private function isWeekend(array $day): bool
+    {
+        return $day['weekday'] >= 6;
+    }
+
+    private function formatDateTime(DateTimeInterface $dateTime): string
+    {
+        $utcDateTime = clone $dateTime;
+        $utcDateTime->setTimezone(new DateTimeZone('UTC'));
+        return $utcDateTime->format('Ymd\THis\Z');
+    }
+
+    private function formatDateTimeLocal(DateTimeInterface $dateTime): string
+    {
+        return $dateTime->format('Ymd\THis');
+    }
+
+    private function generateUid(DateTimeInterface $dateTime): string
+    {
+        return $dateTime->format('Ymd') . '-' . md5($dateTime->format('Ymd') . '-CHECK24') . '@check24.de';
+    }
+    
+    private function generateTimezone(): string
+    {
+        return implode("\r\n", [
+            'BEGIN:VTIMEZONE',
+            'TZID:' . self::TIMEZONE,
+            'X-LIC-LOCATION:' . self::TIMEZONE,
+            'BEGIN:DAYLIGHT',
+            'TZOFFSETFROM:+0100',
+            'TZOFFSETTO:+0200',
+            'TZNAME:CEST',
+            'DTSTART:19700329T020000',
+            'RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=-1SU',
+            'END:DAYLIGHT',
+            'BEGIN:STANDARD',
+            'TZOFFSETFROM:+0200',
+            'TZOFFSETTO:+0100',
+            'TZNAME:CET',
+            'DTSTART:19701025T030000',
+            'RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU',
+            'END:STANDARD',
+            'END:VTIMEZONE',
+        ]);
+    }
+} 
\ No newline at end of file