diff --git a/src/DI/PhpGenerator.php b/src/DI/PhpGenerator.php
index 42a979059..961f96d8f 100644
--- a/src/DI/PhpGenerator.php
+++ b/src/DI/PhpGenerator.php
@@ -181,7 +181,8 @@ public function convertArguments(array $args): array
 				}
 			} elseif (
 				is_object($val)
-				&& !$val instanceof Php\Literal && !$val instanceof \stdClass && !$val instanceof \UnitEnum
+				&& !$val instanceof Php\Literal && !$val instanceof \DateTimeInterface
+				&& (new \ReflectionObject($val))->getProperties(\ReflectionProperty::IS_PRIVATE | \ReflectionProperty::IS_PROTECTED)
 			) {
 				trigger_error(sprintf('Nette DI: suspicious dumping of objects %s when generating the container', $val::class));
 			}
diff --git a/tests/DI/Compiler.parameters.phpt b/tests/DI/Compiler.parameters.phpt
index 778de5e4c..e971ee4d6 100644
--- a/tests/DI/Compiler.parameters.phpt
+++ b/tests/DI/Compiler.parameters.phpt
@@ -68,6 +68,19 @@ test('Statement within string expansion', function () {
 });
 
 
+test('Statement with datetime', function () {
+	$compiler = new DI\Compiler;
+	$container = createContainer($compiler, '
+	parameters:
+		datetime: 2000-01-01 00:00:00 +0000
+
+	services:
+		one: Service(%datetime%)
+	');
+
+	Assert::same('2000-01-01', $container->getService('one')->arg->format('Y-m-d'));
+});
+
 test('Statement within array expansion', function () {
 	$compiler = new DI\Compiler;
 	$container = createContainer($compiler, '