diff --git a/api/html/openapi.json b/api/html/openapi.json
index d04650a..f371e8b 100644
--- a/api/html/openapi.json
+++ b/api/html/openapi.json
@@ -82,6 +82,7 @@
         "tags": [
           "Eintragungen Arbeitszeiten"
         ],
+        "description": "Angabe des Datum im Request-Body werden ignoriert",
         "parameters": [
           {
             "$ref": "#/components/parameters/date"
@@ -167,12 +168,13 @@
         "description": "Eintrag der Arbeitszeit für einen Tag",
         "type": "object",
         "properties": {
-          "date": {
+          "workingDay": {
             "description": "Datum eines Arbeitstages",
             "type": "string",
-            "format": "date"
+            "format": "date",
+            "required": false
           },
-          "workingHours": {
+          "workingTime": {
             "description": "Arbeitszeit des Tages",
             "type": "string",
             "pattern": "[0-5]\\d:[0-5]\\d:[0-5]\\d",
diff --git a/api/tests/_support/Helper/Api.php b/api/tests/_support/Helper/Api.php
index d257c14..86011e9 100644
--- a/api/tests/_support/Helper/Api.php
+++ b/api/tests/_support/Helper/Api.php
@@ -10,10 +10,11 @@ class Api extends Module
 {
 
     const FORMAT_TIME = 'string:regex(/\d+:[0-5]\d:[0-5]\d/)';
+    const FORMAT_DATE = 'string:regex(/\d{4}-\d{2}-\d{2}/)';
 
     const WORKING_HOURS_JSON_FORMAT = [
-        'date'         => 'string:date',
-        'workingHours' => self::FORMAT_TIME,
+        'workingDay'  => self::FORMAT_DATE,
+        'workingTime' => self::FORMAT_TIME,
     ];
 
     const WORKING_HOURS_VIEW_JSON_FORMAT = [
diff --git a/api/tests/api/WorkingHours/CreateWorkingHoursCest.php b/api/tests/api/WorkingHours/CreateWorkingHoursCest.php
index 425a8e9..725b895 100644
--- a/api/tests/api/WorkingHours/CreateWorkingHoursCest.php
+++ b/api/tests/api/WorkingHours/CreateWorkingHoursCest.php
@@ -13,8 +13,8 @@ class CreateWorkingHoursCest
         $I->haveHttpHeader('accept', 'application/json');
         $I->haveHttpHeader('content-type', 'application/json');
         $I->sendPost('/working-hours', [
-            'date'         => '2020-04-01',
-            'workingHours' => '08:00:00',
+            'workingDay'  => '2020-04-01',
+            'workingTime' => '08:00:00',
         ]);
         $I->seeResponseCodeIs(HttpCode::CREATED);
         $I->seeResponseIsJson();
@@ -27,8 +27,8 @@ class CreateWorkingHoursCest
         $I->haveHttpHeader('accept', 'application/json');
         $I->haveHttpHeader('content-type', 'application/json');
         $I->sendPost('/working-hours', [
-            'date'         => '2020-04-01',
-            'workingHours' => 8.0,
+            'workingDay'  => '2020-04-01',
+            'workingTime' => 8.0,
         ]);
         $I->seeResponseCodeIs(HttpCode::BAD_REQUEST);
         $I->seeResponseIsJson();
@@ -41,8 +41,8 @@ class CreateWorkingHoursCest
         $I->haveHttpHeader('accept', 'application/json');
         $I->haveHttpHeader('content-type', 'application/json');
         $I->sendPost('/working-hours', [
-            'date'         => '2020-01-15',
-            'workingHours' => '08:00:00',
+            'workingDay'  => '2020-01-15',
+            'workingTime' => '08:00:00',
         ]);
         $I->seeResponseCodeIs(HttpCode::CONFLICT);
         $I->seeResponseIsJson();
diff --git a/api/tests/api/WorkingHours/UpdateWorkingHoursCest.php b/api/tests/api/WorkingHours/UpdateWorkingHoursCest.php
index 3eae5f3..880a137 100644
--- a/api/tests/api/WorkingHours/UpdateWorkingHoursCest.php
+++ b/api/tests/api/WorkingHours/UpdateWorkingHoursCest.php
@@ -13,8 +13,8 @@ class UpdateWorkingHoursCest
         $I->haveHttpHeader('accept', 'application/json');
         $I->haveHttpHeader('content-type', 'application/json');
         $I->sendPut('/working-hours/2020-01-15', [
-            'date'         => '2020-01-15',
-            'workingHours' => '10:00:00',
+            'workingDay'  => '2020-01-15',
+            'workingTime' => '10:00:00',
         ]);
         $I->seeResponseCodeIs(HttpCode::OK);
         $I->seeResponseIsJson();
@@ -26,8 +26,8 @@ class UpdateWorkingHoursCest
         $I->haveHttpHeader('accept', 'application/json');
         $I->haveHttpHeader('content-type', 'application/json');
         $I->sendPut('/working-hours/2020-01-15', [
-            'date'         => '2020-04-15',
-            'workingHours' => '10:00:00',
+            'workingDay'  => '2020-04-15',
+            'workingTime' => '10:00:00',
         ]);
         $I->seeResponseCodeIs(HttpCode::NOT_FOUND);
         $I->seeResponseIsJson();
@@ -39,8 +39,8 @@ class UpdateWorkingHoursCest
         $I->haveHttpHeader('accept', 'application/json');
         $I->haveHttpHeader('content-type', 'application/json');
         $I->sendPut('/working-hours/2020-01-15', [
-            'date'         => '2020-01-15',
-            'workingHours' => 8.0,
+            'workingDay'  => '2020-01-15',
+            'workingTime' => 8.0,
         ]);
         $I->seeResponseCodeIs(HttpCode::BAD_REQUEST);
         $I->seeResponseIsJson();