diff --git a/api/composer.json b/api/composer.json
index 60d3bac..aa57726 100644
--- a/api/composer.json
+++ b/api/composer.json
@@ -19,7 +19,8 @@
         "slim/slim": "^4.7.1",
         "vlucas/phpdotenv": "^4.2",
         "slim/psr7": "^1.3",
-        "jetbrains/phpstorm-attributes": "^1.0.0"
+        "jetbrains/phpstorm-attributes": "^1.0.0",
+        "myclabs/php-enum": "^1.8.0"
     },
     "require-dev": {
         "phpstan/phpstan": "^0.12.80",
diff --git a/api/src/Models/PeriodDesignationEnum.php b/api/src/Models/PeriodDesignationEnum.php
new file mode 100644
index 0000000..8efffb6
--- /dev/null
+++ b/api/src/Models/PeriodDesignationEnum.php
@@ -0,0 +1,23 @@
+<?php /** @noinspection PhpUnusedPrivateFieldInspection */
+
+
+namespace TorstenHettstedt\TimekeepingApi\Models;
+
+use MyCLabs\Enum\Enum;
+
+/**
+ * Enum-Klasse für die unterstützten Periode-Definitionen.
+ * Der Wert der Periode ist ein Format-String für {@link https://secure.php.net/manual/en/datetime.format.php}.
+ *
+ * @extends Enum<string>
+ *
+ * @method static PeriodDesignationEnum WEEKLY()
+ * @method static PeriodDesignationEnum MONTHLY()
+ * @method static PeriodDesignationEnum YEARLY()
+ */
+class PeriodDesignationEnum extends Enum
+{
+    private const WEEKLY = 'Y#W';
+    private const MONTHLY = 'Y-m';
+    private const YEARLY = 'Y';
+}
\ No newline at end of file
diff --git a/api/src/Models/WorkingHoursView.php b/api/src/Models/WorkingHoursView.php
new file mode 100644
index 0000000..fdfa397
--- /dev/null
+++ b/api/src/Models/WorkingHoursView.php
@@ -0,0 +1,102 @@
+<?php
+
+
+namespace TorstenHettstedt\TimekeepingApi\Models;
+
+
+use DateInterval;
+use DateTimeInterface;
+use JetBrains\PhpStorm\ArrayShape;
+
+class WorkingHoursView implements ModelInterface
+{
+    protected DateTimeInterface $period;
+    protected PeriodDesignationEnum $periodDesignation;
+    protected int $workingDays;
+    protected DateInterval $totalHours;
+    protected DateInterval $overtime;
+
+    /**
+     * WorkingHoursView constructor.
+     *
+     * @param DateTimeInterface     $period
+     * @param PeriodDesignationEnum $periodDesignation
+     * @param int                   $workingDays
+     * @param DateInterval          $totalHours
+     * @param DateInterval          $overtime
+     */
+    public function __construct(
+        DateTimeInterface $period,
+        PeriodDesignationEnum $periodDesignation,
+        int $workingDays,
+        DateInterval $totalHours,
+        DateInterval $overtime
+    ) {
+        $this->period = $period;
+        $this->periodDesignation = $periodDesignation;
+        $this->workingDays = $workingDays;
+        $this->totalHours = $totalHours;
+        $this->overtime = $overtime;
+    }
+
+    /**
+     * @return DateTimeInterface
+     */
+    public function getPeriod(): DateTimeInterface
+    {
+        return $this->period;
+    }
+
+    /**
+     * @return PeriodDesignationEnum
+     */
+    public function getPeriodDesignation(): PeriodDesignationEnum
+    {
+        return $this->periodDesignation;
+    }
+
+    /**
+     * @return int
+     */
+    public function getWorkingDays(): int
+    {
+        return $this->workingDays;
+    }
+
+    /**
+     * @return DateInterval
+     */
+    public function getTotalHours(): DateInterval
+    {
+        return $this->totalHours;
+    }
+
+    /**
+     * @return DateInterval
+     */
+    public function getOvertime(): DateInterval
+    {
+        return $this->overtime;
+    }
+
+    /**
+     * @inheritDoc
+     *
+     * @return array<string, mixed>
+     */
+    #[ArrayShape(['period'            => "string",
+                  'periodDesignation' => "string",
+                  'totalHours'        => "string",
+                  'workingDays'       => "int",
+                  'overtime'          => "string"
+    ])] public function jsonSerialize(): array
+    {
+        return [
+            'period'            => $this->getPeriod()->format($this->getPeriodDesignation()->getValue()),
+            'periodDesignation' => strtolower($this->getPeriodDesignation()->getKey()),
+            'workingDays'       => $this->getWorkingDays(),
+            'totalHours'        => $this->getTotalHours()->format('%H:%I:%S'),
+            'overtime'          => $this->getOvertime()->format('%H:%I:%S')
+        ];
+    }
+}
\ No newline at end of file
diff --git a/api/tests/unit/Models/WorkingHoursViewTest.php b/api/tests/unit/Models/WorkingHoursViewTest.php
new file mode 100644
index 0000000..d26c055
--- /dev/null
+++ b/api/tests/unit/Models/WorkingHoursViewTest.php
@@ -0,0 +1,113 @@
+<?php
+
+namespace TorstenHettstedt\TimekeepingApi\Tests\Unit\Models;
+
+use Codeception\Test\Unit;
+use DateInterval;
+use DateTime;
+use DateTimeInterface;
+use TorstenHettstedt\TimekeepingApi\Models\PeriodDesignationEnum;
+use TorstenHettstedt\TimekeepingApi\Models\WorkingHoursView;
+
+class WorkingHoursViewTest extends Unit
+{
+
+    /**
+     * @return array[]
+     */
+    public function workingHoursProvider(): array
+    {
+        return [
+            [
+                new DateTime('2020-11-30'),
+                PeriodDesignationEnum::WEEKLY(),
+                15,
+                new DateInterval("PT32H22M"),
+                new DateInterval("PT22M"),
+                [
+                    'period'            => '2020#49',
+                    'periodDesignation' => 'weekly',
+                    'workingDays'       => 15,
+                    'totalHours'        => '32:22:00',
+                    'overtime'          => '00:22:00'
+                ],
+            ],
+            [
+                new DateTime('2020-11-30'),
+                PeriodDesignationEnum::MONTHLY(),
+                15,
+                new DateInterval("PT32H22M"),
+                new DateInterval("PT22M"),
+                [
+                    'period'            => '2020-11',
+                    'periodDesignation' => 'monthly',
+                    'workingDays'       => 15,
+                    'totalHours'        => '32:22:00',
+                    'overtime'          => '00:22:00'
+                ],
+            ],
+            [
+                new DateTime('2020-11-30'),
+                PeriodDesignationEnum::YEARLY(),
+                15,
+                new DateInterval("PT32H22M"),
+                new DateInterval("PT22M"),
+                [
+                    'period'            => '2020',
+                    'periodDesignation' => 'yearly',
+                    'workingDays'       => 15,
+                    'totalHours'        => '32:22:00',
+                    'overtime'          => '00:22:00'
+                ],
+            ],
+        ];
+    }
+
+    /**
+     * @param DateTimeInterface          $period
+     * @param PeriodDesignationEnum      $periodDesignation
+     * @param int                        $workingDays
+     * @param DateInterval               $totalHours
+     * @param DateInterval               $overtime
+     * @param array<string, string>      $should_json
+     *
+     * @dataProvider workingHoursProvider
+     */
+    public function testWorkingHoursViewWithContent(
+        DateTimeInterface $period,
+        PeriodDesignationEnum $periodDesignation,
+        int $workingDays,
+        DateInterval $totalHours,
+        DateInterval $overtime,
+        array $should_json
+    ): void
+    {
+
+        $obj = new WorkingHoursView($period, $periodDesignation, $workingDays, $totalHours, $overtime);
+
+        $this->assertNotNull($obj->getPeriod());
+        $this->assertInstanceOf(DateTimeInterface::class, $obj->getPeriod());
+        $this->assertEquals($period, $obj->getPeriod());
+
+        $this->assertNotNull($obj->getPeriodDesignation());
+        $this->assertInstanceOf(PeriodDesignationEnum::class, $obj->getPeriodDesignation());
+        $this->assertEquals($periodDesignation, $obj->getPeriodDesignation());
+
+        $this->assertNotNull($obj->getWorkingDays());
+        $this->assertIsInt($obj->getWorkingDays());
+        $this->assertEquals($workingDays, $obj->getWorkingDays());
+
+        $this->assertNotNull($obj->getTotalHours());
+        $this->assertInstanceOf(DateInterval::class, $obj->getTotalHours());
+        $this->assertEquals($totalHours, $obj->getTotalHours());
+
+        $this->assertNotNull($obj->getOvertime());
+        $this->assertInstanceOf(DateInterval::class, $obj->getOvertime());
+        $this->assertEquals($overtime, $obj->getOvertime());
+
+
+        $json = $obj->jsonSerialize();
+        $this->assertIsArray($json);
+        $this->assertEquals($should_json, $json);
+    }
+}