[5.4] Make date/datetime cast difference more explicit by removing time part.

src/Illuminate/Database/Eloquent/Model.php

@@ -2920,6 +2920,7 @@ protected function castAttribute($key, $value)
             case 'collection':
                 return new BaseCollection($this->fromJson($value));
             case 'date':
+                return $this->asDate($value);
             case 'datetime':
                 return $this->asDateTime($value);
             case 'timestamp':
@@ -3028,6 +3029,17 @@ public function fromDateTime($value)
         return $value->format($format);
     }
 
+    /**
+     * Return a timestamp as DateTime object with time set to 00:00:00.
+     *
+     * @param  mixed  $value
+     * @return \Carbon\Carbon
+     */
+    protected function asDate($value)
+    {
+        return $this->asDateTime($value)->startOfDay();
+    }
+
     /**
      * Return a timestamp as DateTime object.
      *

tests/Database/DatabaseEloquentModelTest.php

@@ -1409,6 +1409,18 @@ public function testModelAttributesAreCastedWhenPresentInCastsArray()
         $this->assertEquals(-14173440, $arr['timestampAttribute']);
     }
 
+    public function testModelDateAttributeCastingResetsTime()
+    {
+        $model = new EloquentModelCastingStub;
+        $model->setDateFormat('Y-m-d H:i:s');
+        $model->dateAttribute = '1969-07-20 22:56:00';
+
+        $this->assertEquals('1969-07-20 00:00:00', $model->dateAttribute->toDateTimeString());
+
+        $arr = $model->toArray();
+        $this->assertEquals('1969-07-20 00:00:00', $arr['dateAttribute']);
+    }
+
     public function testModelAttributeCastingPreservesNull()
     {
         $model = new EloquentModelCastingStub;