diff --git a/src/API/TimesheetController.php b/src/API/TimesheetController.php
index a61aa181..4572b8da 100644
--- a/src/API/TimesheetController.php
+++ b/src/API/TimesheetController.php
@@ -656,6 +656,47 @@ class TimesheetController extends BaseApiController
         return $this->viewHandler->handle($view);
     }
 
+    /**
+     * Duplicates an existing timesheet record
+     *
+     * @SWG\Response(
+     *      response=200,
+     *      description="Duplicates a timesheet record, resetting the export state only.",
+     *      @SWG\Schema(ref="#/definitions/TimesheetEntity")
+     * )
+     * @SWG\Parameter(
+     *      name="id",
+     *      in="path",
+     *      type="integer",
+     *      description="Timesheet record ID to duplicate",
+     *      required=true,
+     * )
+     *
+     * @ApiSecurity(name="apiUser")
+     * @ApiSecurity(name="apiToken")
+     */
+    public function duplicateAction(int $id): Response
+    {
+        $timesheet = $this->repository->find($id);
+
+        if (null === $timesheet) {
+            throw new NotFoundException();
+        }
+
+        if (!$this->isGranted('duplicate', $timesheet)) {
+            throw new AccessDeniedHttpException('You are not allowed to duplicate this timesheet');
+        }
+
+        $copyTimesheet = clone $timesheet;
+
+        $this->service->saveNewTimesheet($copyTimesheet);
+
+        $view = new View($copyTimesheet, 200);
+        $view->getContext()->setGroups(['Default', 'Entity', 'Timesheet']);
+
+        return $this->viewHandler->handle($view);
+    }
+
     /**
      * Switch the export state of a timesheet record to (un-)lock it
      *
diff --git a/src/Entity/Timesheet.php b/src/Entity/Timesheet.php
index 17d7fcfa..6d79706e 100644
--- a/src/Entity/Timesheet.php
+++ b/src/Entity/Timesheet.php
@@ -45,7 +45,7 @@ class Timesheet implements EntityWithMetaFields, ExportItemInterface
     public const CATEGORY_WORK = 'work';
 
     /**
-     * @var int
+     * @var int|null
      *
      * @ORM\Column(name="id", type="integer")
      * @ORM\Id
@@ -537,4 +537,12 @@ class Timesheet implements EntityWithMetaFields, ExportItemInterface
 
         return $this;
     }
+
+    public function __clone()
+    {
+        if ($this->id) {
+            $this->id = null;
+            $this->exported = false;
+        }
+    }
 }
diff --git a/src/Voter/TimesheetVoter.php b/src/Voter/TimesheetVoter.php
index 5c293d5a..4cf503bd 100644
--- a/src/Voter/TimesheetVoter.php
+++ b/src/Voter/TimesheetVoter.php
@@ -41,6 +41,7 @@ class TimesheetVoter extends AbstractVoter
         self::VIEW_RATE,
         self::EDIT_RATE,
         self::EDIT_EXPORT,
+        'duplicate'
     ];
 
     /**
@@ -99,6 +100,10 @@ class TimesheetVoter extends AbstractVoter
                 $permission .= $attribute;
                 break;
 
+            case 'duplicate':
+                $permission = self::EDIT;
+                break;
+
             case self::VIEW_RATE:
             case self::EDIT_RATE:
             case self::STOP:
diff --git a/templates/timesheet/actions.html.twig b/templates/timesheet/actions.html.twig
index 0d767ec0..c258a5c2 100644
--- a/templates/timesheet/actions.html.twig
+++ b/templates/timesheet/actions.html.twig
@@ -39,6 +39,10 @@
             {% set actions = actions|merge({'repeat': {'url': path('restart_timesheet', {'id' : timesheet.id}), 'class': 'api-link', 'attr': {'data-payload': '{"copy": "all"}', 'data-event': 'kimai.timesheetStart kimai.timesheetUpdate', 'data-method': 'PATCH', 'data-msg-error': 'timesheet.start.error', 'data-msg-success': 'timesheet.start.success'}}}) %}
         {% endif %}
 
+        {% if is_granted('duplicate', timesheet) %}
+            {% set actions = actions|merge({'copy': {'url': path('duplicate_timesheet', {'id' : timesheet.id}), 'class': 'api-link', 'attr': {'data-payload': '{"copy": "all"}', 'data-event': 'kimai.timesheetStart kimai.timesheetUpdate', 'data-method': 'PATCH', 'data-msg-error': 'timesheet.update.error', 'data-msg-success': 'timesheet.update.success'}}}) %}
+        {% endif %}
+
         {% if is_granted('edit', timesheet) %}
             {% set class = '' %}
             {% if view != 'edit' %}
diff --git a/tests/API/TimesheetControllerTest.php b/tests/API/TimesheetControllerTest.php
index 1b1b1dce..7561c887 100644
--- a/tests/API/TimesheetControllerTest.php
+++ b/tests/API/TimesheetControllerTest.php
@@ -786,6 +786,44 @@ class TimesheetControllerTest extends APIControllerBaseTest
         $this->assertEntityNotFoundForPatch(User::ROLE_USER, '/api/timesheets/42/restart', []);
     }
 
+    public function testDuplicateAction()
+    {
+        $client = $this->getClientForAuthenticatedUser(User::ROLE_ADMIN);
+        $data = [
+            'activity' => 1,
+            'project' => 1,
+            'begin' => ($this->dateTime->createDateTime('- 16 hours'))->format('Y-m-d H:m:0'),
+            'end' => ($this->dateTime->createDateTime())->format('Y-m-d H:m:0'),
+            'description' => 'foo',
+            'fixedRate' => 2016,
+            'hourlyRate' => 127
+        ];
+        $this->request($client, '/api/timesheets', 'POST', [], json_encode($data));
+        $this->assertTrue($client->getResponse()->isSuccessful());
+
+        $result = json_decode($client->getResponse()->getContent(), true);
+        $this->assertIsArray($result);
+        $this->assertDefaultStructure($result);
+        $this->assertNotEmpty($result['id']);
+        $this->assertTrue($result['duration'] == 57600 || $result['duration'] == 57660); // 1 minute rounding might be applied
+        $this->assertEquals(2016, $result['rate']);
+
+        $this->request($client, '/api/timesheets/' . $result['id'] . '/duplicate', 'PATCH');
+        $this->assertTrue($client->getResponse()->isSuccessful());
+
+        $result = json_decode($client->getResponse()->getContent(), true);
+        $this->assertIsArray($result);
+        $this->assertDefaultStructure($result);
+        $this->assertNotEmpty($result['id']);
+        $this->assertTrue($result['duration'] == 57600 || $result['duration'] == 57660); // 1 minute rounding might be applied
+        $this->assertEquals(2016, $result['rate']);
+    }
+
+    public function testDuplicateThrowsNotFound()
+    {
+        $this->assertEntityNotFoundForPatch(User::ROLE_ADMIN, '/api/timesheets/11/duplicate', []);
+    }
+
     public function testExportAction()
     {
         $client = $this->getClientForAuthenticatedUser(User::ROLE_ADMIN);