diff --git a/includes/helper/shift_helper.php b/includes/helper/shift_helper.php
index 54c95fb1..dc0a2a1c 100644
--- a/includes/helper/shift_helper.php
+++ b/includes/helper/shift_helper.php
@@ -3,7 +3,6 @@
 namespace Engelsystem\Events\Listener;
 
 use Carbon\Carbon;
-use Engelsystem\Helpers\Shifts;
 use Engelsystem\Mail\EngelsystemMailer;
 use Engelsystem\Models\Shifts\Shift as ShiftModel;
 use Engelsystem\Models\Shifts\ShiftEntry;
@@ -32,7 +31,7 @@ class Shift
             $workLog->worked_at = $shift->start->copy()->startOfDay();
             $workLog->hours =
                 (($shift->end->timestamp - $shift->start->timestamp) / 60 / 60)
-                * Shifts::getNightShiftMultiplier($shift->start, $shift->end);
+                * $shift->getNightShiftMultiplier();
             $workLog->comment = sprintf(
                 __('%s (%s as %s) in %s, %s - %s'),
                 $shift->shiftType->name,
diff --git a/includes/model/User_model.php b/includes/model/User_model.php
index 55a2af56..56116294 100644
--- a/includes/model/User_model.php
+++ b/includes/model/User_model.php
@@ -123,7 +123,7 @@ function User_get_shifts_sum_query()
         return 'COALESCE(SUM(UNIX_TIMESTAMP(shifts.end) - UNIX_TIMESTAMP(shifts.start)), 0)';
     }
 
-    /* @see \Engelsystem\Helpers\Shifts::isNightShift to keep it in sync */
+    /* @see \Engelsystem\Models\Shifts\Shift::isNightShift to keep it in sync */
     return sprintf(
         '
             COALESCE(SUM(
diff --git a/includes/view/ShiftCalendarShiftRenderer.php b/includes/view/ShiftCalendarShiftRenderer.php
index dbdc2d1b..ed9a6cb4 100644
--- a/includes/view/ShiftCalendarShiftRenderer.php
+++ b/includes/view/ShiftCalendarShiftRenderer.php
@@ -3,7 +3,6 @@
 namespace Engelsystem;
 
 use Engelsystem\Config\GoodieType;
-use Engelsystem\Helpers\Shifts;
 use Engelsystem\Models\AngelType;
 use Engelsystem\Models\Shifts\Shift;
 use Engelsystem\Models\Shifts\ShiftEntry;
@@ -245,7 +244,6 @@ class ShiftCalendarShiftRenderer
      */
     private function renderShiftHead(Shift $shift, $class, $needed_angeltypes_count)
     {
-        $nightShiftsConfig = config('night_shifts');
         $goodie = GoodieType::from(config('goodie_type'));
         $goodie_enabled = $goodie !== GoodieType::None;
 
@@ -281,7 +279,7 @@ class ShiftCalendarShiftRenderer
                 ]);
         }
         $night_shift = '';
-        if (Shifts::isNightShift($shift->start, $shift->end) && $nightShiftsConfig['enabled'] && $goodie_enabled) {
+        if ($shift->isNightShift() && $goodie_enabled) {
             $night_shift = ' <i class="bi-moon-stars"></i>';
         }
 
diff --git a/includes/view/Shifts_view.php b/includes/view/Shifts_view.php
index d615d3c3..19f5dd7d 100644
--- a/includes/view/Shifts_view.php
+++ b/includes/view/Shifts_view.php
@@ -2,7 +2,6 @@
 
 use Engelsystem\Config\GoodieType;
 use Engelsystem\Helpers\Carbon;
-use Engelsystem\Helpers\Shifts;
 use Engelsystem\Models\AngelType;
 use Engelsystem\Models\Location;
 use Engelsystem\Models\Shifts\Shift;
@@ -269,7 +268,7 @@ function Shift_view(
     $start = $shift->start->format(__('general.datetime'));
 
     $night_shift_hint = '';
-    if (Shifts::isNightShift($shift->start, $shift->end) && $nightShiftsConfig['enabled'] && $goodie_enabled) {
+    if ($shift->isNightShift() && $goodie_enabled) {
         $night_shift_hint = ' <small><span class="bi bi-moon-stars text-info" data-bs-toggle="tooltip" title="'
             . __('Night shifts between %d and %d am are multiplied by %d for the %s score.', [
                 $nightShiftsConfig['start'],
diff --git a/includes/view/User_view.php b/includes/view/User_view.php
index ab666189..d2d21b4a 100644
--- a/includes/view/User_view.php
+++ b/includes/view/User_view.php
@@ -2,7 +2,6 @@
 
 use Carbon\Carbon;
 use Engelsystem\Config\GoodieType;
-use Engelsystem\Helpers\Shifts;
 use Engelsystem\Models\AngelType;
 use Engelsystem\Models\Group;
 use Engelsystem\Models\Shifts\Shift;
@@ -325,7 +324,7 @@ function User_view_myshift(Shift $shift, $user_source, $its_me)
     }
 
     $night_shift = '';
-    if (Shifts::isNightShift($shift->start, $shift->end) && $nightShiftsConfig['enabled'] && $goodie_enabled) {
+    if ($shift->isNightShift() && $goodie_enabled) {
         $night_shift = ' <span class="bi bi-moon-stars text-info" data-bs-toggle="tooltip" title="'
             . __('Night shifts between %d and %d am are multiplied by %d for the %s score.', [
                 $nightShiftsConfig['start'],
diff --git a/src/Helpers/Shifts.php b/src/Helpers/Shifts.php
deleted file mode 100644
index 8d192447..00000000
--- a/src/Helpers/Shifts.php
+++ /dev/null
@@ -1,44 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Engelsystem\Helpers;
-
-use Carbon\Carbon;
-
-// Should be moved to the shift model if it's available
-class Shifts
-{
-    /**
-     * Check if a time range is a night shift
-     */
-    public static function isNightShift(Carbon $start, Carbon $end): bool
-    {
-        $config = config('night_shifts');
-
-        /** @see User_get_shifts_sum_query to keep it in sync */
-        return $config['enabled'] && (
-                // Starts during night
-                $start->hour >= $config['start'] && $start->hour < $config['end']
-                // Ends during night
-                || (
-                    $end->hour > $config['start']
-                    || $end->hour == $config['start'] && $end->minute > 0
-                ) && $end->hour <= $config['end']
-                // Starts before and ends after night
-                || $start->hour <= $config['start'] && $end->hour >= $config['end']
-            );
-    }
-
-    /**
-     * Calculate a shifts night multiplier
-     */
-    public static function getNightShiftMultiplier(Carbon $start, Carbon $end): float
-    {
-        if (!self::isNightShift($start, $end)) {
-            return 1;
-        }
-
-        return config('night_shifts')['multiplier'];
-    }
-}
diff --git a/src/Models/Shifts/Shift.php b/src/Models/Shifts/Shift.php
index f062d72e..42e90f13 100644
--- a/src/Models/Shifts/Shift.php
+++ b/src/Models/Shifts/Shift.php
@@ -125,4 +125,37 @@ class Shift extends BaseModel
     {
         return $this->belongsTo(User::class, 'updated_by');
     }
+
+    /**
+     * Check if the shift is a night shift
+     */
+    public function isNightShift(): bool
+    {
+        $config = config('night_shifts');
+
+        /** @see User_get_shifts_sum_query to keep it in sync */
+        return $config['enabled'] && (
+                // Starts during night
+                $this->start->hour >= $config['start'] && $this->start->hour < $config['end']
+                // Ends during night
+                || (
+                    $this->end->hour > $config['start']
+                    || $this->end->hour == $config['start'] && $this->end->minute > 0
+                ) && $this->end->hour <= $config['end']
+                // Starts before and ends after night
+                || $this->start->hour <= $config['start'] && $this->end->hour >= $config['end']
+            );
+    }
+
+    /**
+     * Calculate the shifts night multiplier
+     */
+    public function getNightShiftMultiplier(): float
+    {
+        if (!$this->isNightShift()) {
+            return 1;
+        }
+
+        return config('night_shifts')['multiplier'];
+    }
 }
diff --git a/tests/Unit/Helpers/ShiftsTest.php b/tests/Unit/Helpers/ShiftsTest.php
deleted file mode 100644
index e2863427..00000000
--- a/tests/Unit/Helpers/ShiftsTest.php
+++ /dev/null
@@ -1,105 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Engelsystem\Test\Unit\Helpers;
-
-use Engelsystem\Config\Config;
-use Engelsystem\Helpers\Carbon;
-use Engelsystem\Helpers\Shifts;
-use Engelsystem\Test\Unit\TestCase;
-
-class ShiftsTest extends TestCase
-{
-    /**
-     * @covers \Engelsystem\Helpers\Shifts::isNightShift
-     */
-    public function testIsNightShiftDisabled(): void
-    {
-        $config = new Config(['night_shifts' => [
-            'enabled'    => false,
-            'start'      => 2,
-            'end'        => 8,
-            'multiplier' => 2,
-        ]]);
-        $this->app->instance('config', $config);
-
-        // At night but disabled
-        $this->assertFalse(Shifts::isNightShift(
-            new Carbon('2042-01-01 04:00'),
-            new Carbon('2042-01-01 05:00')
-        ));
-    }
-
-    /**
-     * @return array{0: string, 1: string, 2: boolean}[]
-     */
-    public function nightShiftData(): array
-    {
-        // $start, $end, $isNightShift
-        return [
-            // Is night shift
-            ['2042-01-01 04:00', '2042-01-01 05:00', true],
-            // Is night shift
-            ['2042-01-01 02:00', '2042-01-01 02:15', true],
-            // Is night shift
-            ['2042-01-01 07:45', '2042-01-01 08:00', true],
-            // Starts as night shift
-            ['2042-01-01 07:59', '2042-01-01 09:00', true],
-            // Ends as night shift
-            ['2042-01-01 00:00', '2042-01-01 02:01', true],
-            // Equals night shift
-            ['2042-01-01 02:00', '2042-01-01 08:00', true],
-            // Contains night shift
-            ['2042-01-01 01:00', '2042-01-01 09:00', true],
-            // Too early
-            ['2042-01-01 00:00', '2042-01-01 02:00', false],
-            // Too late
-            ['2042-01-01 08:00', '2042-01-01 10:00', false],
-            // Out of range
-            ['2042-01-01 23:00', '2042-01-02 01:00', false],
-        ];
-    }
-
-    /**
-     * @covers       \Engelsystem\Helpers\Shifts::isNightShift
-     * @dataProvider nightShiftData
-     */
-    public function testIsNightShiftEnabled(string $start, string $end, bool $isNightShift): void
-    {
-        $config = new Config(['night_shifts' => [
-            'enabled'    => true,
-            'start'      => 2,
-            'end'        => 8,
-            'multiplier' => 2,
-        ]]);
-        $this->app->instance('config', $config);
-
-        $this->assertEquals($isNightShift, Shifts::isNightShift(new Carbon($start), new Carbon($end)));
-    }
-
-    /**
-     * @covers \Engelsystem\Helpers\Shifts::getNightShiftMultiplier
-     */
-    public function testGetNightShiftMultiplier(): void
-    {
-        $config = new Config(['night_shifts' => [
-            'enabled'    => true,
-            'start'      => 2,
-            'end'        => 8,
-            'multiplier' => 2,
-        ]]);
-        $this->app->instance('config', $config);
-
-        $this->assertEquals(2, Shifts::getNightShiftMultiplier(
-            new Carbon('2042-01-01 02:00'),
-            new Carbon('2042-01-01 04:00')
-        ));
-
-        $config->set('night_shifts', array_merge($config->get('night_shifts'), ['enabled' => false]));
-        $this->assertEquals(1, Shifts::getNightShiftMultiplier(
-            new Carbon('2042-01-01 02:00'),
-            new Carbon('2042-01-01 04:00')
-        ));
-    }
-}
diff --git a/tests/Unit/Models/Shifts/ShiftTest.php b/tests/Unit/Models/Shifts/ShiftTest.php
index b129a112..f138d34d 100644
--- a/tests/Unit/Models/Shifts/ShiftTest.php
+++ b/tests/Unit/Models/Shifts/ShiftTest.php
@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Engelsystem\Test\Unit\Models\Shifts;
 
+use Engelsystem\Config\Config;
 use Engelsystem\Helpers\Carbon;
 use Engelsystem\Models\Location;
 use Engelsystem\Models\Shifts\NeededAngelType;
@@ -111,4 +112,102 @@ class ShiftTest extends ModelTest
 
         $this->assertCount(5, $shift->shiftEntries);
     }
+
+    /**
+     * @covers \Engelsystem\Models\Shifts\Shift::isNightShift
+     */
+    public function testIsNightShiftDisabled(): void
+    {
+        $config = new Config(['night_shifts' => [
+            'enabled'    => false,
+            'start'      => 2,
+            'end'        => 8,
+            'multiplier' => 2,
+        ]]);
+        $this->app->instance('config', $config);
+
+        $shift = new Shift([
+            'start' => new Carbon('2042-01-01 04:00'),
+            'end' => new Carbon('2042-01-01 05:00'),
+        ]);
+
+        // At night but disabled
+        $this->assertFalse($shift->isNightShift());
+    }
+
+    /**
+     * @return array{0: string, 1: string, 2: boolean}[]
+     */
+    public function nightShiftData(): array
+    {
+        // $start, $end, $isNightShift
+        return [
+            // Is night shift
+            ['2042-01-01 04:00', '2042-01-01 05:00', true],
+            // Is night shift
+            ['2042-01-01 02:00', '2042-01-01 02:15', true],
+            // Is night shift
+            ['2042-01-01 07:45', '2042-01-01 08:00', true],
+            // Starts as night shift
+            ['2042-01-01 07:59', '2042-01-01 09:00', true],
+            // Ends as night shift
+            ['2042-01-01 00:00', '2042-01-01 02:01', true],
+            // Equals night shift
+            ['2042-01-01 02:00', '2042-01-01 08:00', true],
+            // Contains night shift
+            ['2042-01-01 01:00', '2042-01-01 09:00', true],
+            // Too early
+            ['2042-01-01 00:00', '2042-01-01 02:00', false],
+            // Too late
+            ['2042-01-01 08:00', '2042-01-01 10:00', false],
+            // Out of range
+            ['2042-01-01 23:00', '2042-01-02 01:00', false],
+        ];
+    }
+
+    /**
+     * @covers       \Engelsystem\Models\Shifts\Shift::isNightShift
+     * @dataProvider nightShiftData
+     */
+    public function testIsNightShiftEnabled(string $start, string $end, bool $isNightShift): void
+    {
+        $config = new Config(['night_shifts' => [
+            'enabled'    => true,
+            'start'      => 2,
+            'end'        => 8,
+            'multiplier' => 2,
+        ]]);
+        $this->app->instance('config', $config);
+
+        $shift = new Shift([
+            'start' => new Carbon($start),
+            'end' => new Carbon($end),
+        ]);
+
+        $this->assertEquals($isNightShift, $shift->isNightShift());
+    }
+
+    /**
+     * @covers \Engelsystem\Models\Shifts\Shift::getNightShiftMultiplier
+     */
+    public function testGetNightShiftMultiplier(): void
+    {
+        $config = new Config(['night_shifts' => [
+            'enabled'    => true,
+            'start'      => 2,
+            'end'        => 8,
+            'multiplier' => 2,
+        ]]);
+        $this->app->instance('config', $config);
+
+        $shift = new Shift([
+            'start' => new Carbon('2042-01-01 02:00'),
+            'end' => new Carbon('2042-01-01 04:00'),
+        ]);
+
+        $this->assertEquals(2, $shift->getNightShiftMultiplier());
+
+        $config->set('night_shifts', array_merge($config->get('night_shifts'), ['enabled' => false]));
+        $this->assertEquals(1, $shift->getNightShiftMultiplier());
+    }
 }