diff --git a/app/Resources/EventResource.php b/app/Resources/EventResource.php
index c4858ff..4f22fc7 100644
--- a/app/Resources/EventResource.php
+++ b/app/Resources/EventResource.php
@@ -239,8 +239,8 @@ class EventResource extends JsonResource{
     }
 
     public function getMultiplier() : float {
-        $earlyBirdEnd = $this->event->early_bird_end;
-        if ($earlyBirdEnd > now()) {
+        // Der Frühbucherpreis gilt einschließlich des ganzen Stichtags.
+        if (now() <= $this->event->early_bird_end->copy()->endOfDay()) {
             return 1;
         }
 
diff --git a/app/Tasks/CloseEvent.php b/app/Tasks/CloseEvent.php
index 575578d..e43b9a2 100644
--- a/app/Tasks/CloseEvent.php
+++ b/app/Tasks/CloseEvent.php
@@ -12,7 +12,8 @@ class CloseEvent implements CronTask {
         $eventRepository = new EventRepository();
         /** @var Event $event */
         foreach ($eventRepository->getAvailable(false) as $event) {
-            if ($event->registration_final_end <= $now ) {
+            // Der Anmeldeschluss gilt einschließlich des ganzen Tages: bis 23:59:59 darf man sich anmelden.
+            if ($now > $event->registration_final_end->copy()->endOfDay()) {
                 $event->registration_allowed = false;
                 $event->save();
             }
diff --git a/tests/Feature/EventDeadlineTest.php b/tests/Feature/EventDeadlineTest.php
new file mode 100644
index 0000000..a6d0121
--- /dev/null
+++ b/tests/Feature/EventDeadlineTest.php
@@ -0,0 +1,109 @@
+<?php
+
+namespace Tests\Feature;
+
+use App\Models\Event;
+use App\Models\Tenant;
+use App\Resources\EventResource;
+use App\Tasks\CloseEvent;
+use DateTime;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\DB;
+use Tests\TestCase;
+
+/**
+ * Anmeldeschluss und Early-Bird-Ende einer Veranstaltung.
+ *
+ * Beide sind ein Tag, keine Uhrzeit: Sie gelten einschließlich des ganzen Stichtags bis 23:59.
+ */
+class EventDeadlineTest extends TestCase
+{
+    use RefreshDatabase;
+
+    private Tenant $tenant;
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->tenant = Tenant::create([
+            'slug' => 'tv',
+            'name' => 'Test',
+            'email' => 't@example.com',
+            'email_finance' => 'finance@example.com',
+            'url' => 'test.local',
+            'account_name' => 'Test e.V.',
+            'account_iban' => 'DE00',
+            'account_bic' => 'XY',
+            'city' => 'Stadt',
+            'postcode' => '00000',
+            'is_active_local_group' => true,
+            'has_active_instance' => true,
+        ]);
+
+        app()->instance('tenant', $this->tenant);
+
+        DB::table('participation_fee_types')->insert(['slug' => 'fixed', 'name' => 'Fix']);
+    }
+
+    public function test_am_anmeldeschluss_um_2359_bleibt_die_anmeldung_offen(): void
+    {
+        $event = $this->makeEvent();
+
+        $this->travelTo(new DateTime('2026-09-11 23:59:00'));
+        new CloseEvent()->handle();
+
+        $this->assertTrue($event->fresh()->registration_allowed);
+    }
+
+    public function test_am_folgetag_schliesst_der_cron_die_anmeldung(): void
+    {
+        $event = $this->makeEvent();
+
+        $this->travelTo(new DateTime('2026-09-12 00:10:00'));
+        new CloseEvent()->handle();
+
+        $this->assertFalse($event->fresh()->registration_allowed);
+    }
+
+    public function test_am_early_bird_stichtag_um_2359_gilt_der_fruehbucherpreis(): void
+    {
+        $event = $this->makeEvent();
+
+        $this->travelTo(new DateTime('2026-09-11 23:59:00'));
+
+        $this->assertEqualsWithDelta(1.0, new EventResource($event)->getMultiplier(), 0.0001);
+    }
+
+    public function test_am_tag_nach_dem_early_bird_stichtag_gilt_der_aufschlag(): void
+    {
+        $event = $this->makeEvent();
+
+        $this->travelTo(new DateTime('2026-09-12 00:00:01'));
+
+        $this->assertEqualsWithDelta(1.2, new EventResource($event)->getMultiplier(), 0.0001);
+    }
+
+    private function makeEvent(): Event
+    {
+        return Event::create([
+            'tenant' => $this->tenant->slug,
+            'name' => 'Event',
+            'identifier' => 'evt-' . uniqid(),
+            'location' => 'Ort',
+            'postal_code' => '00000',
+            'email' => 'e@example.com',
+            'start_date' => '2026-09-20',
+            'end_date' => '2026-09-25',
+            'early_bird_end' => '2026-09-11',
+            'registration_final_end' => '2026-09-11',
+            'early_bird_end_amount_increase' => 20,
+            'registration_allowed' => true,
+            'account_owner' => 'Owner',
+            'account_iban' => 'DE00',
+            'participation_fee_type' => 'fixed',
+            'pay_per_day' => false,
+            'pay_direct' => false,
+        ]);
+    }
+}