diff --git a/src/JsonMapper.php b/src/JsonMapper.php
index 8bfdb7c..36cef03 100644
--- a/src/JsonMapper.php
+++ b/src/JsonMapper.php
@@ -242,6 +242,12 @@ private function mapValue(
                 }
             }
 
+           foreach ($parameterType->types as $type) {
+               if ($type->name == \DateTime::class) {
+                   return new \DateTime($jsonValue);
+                }
+           }
+
             // TODO "Parameter %s of class %s does not accept string" + JSON path
             throw new JsonMapperException('Property ' . $jsonPropertyName . ' cannot be a string.');
         }