diff --git a/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php b/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php
index f0b5ac2ac4df8..2fcf2005185b3 100644
--- a/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php
+++ b/src/Symfony/Component/Form/Extension/Core/Type/TimeType.php
@@ -57,16 +57,18 @@ public function buildForm(FormBuilderInterface $builder, array $options)
         if ('single_text' === $options['widget']) {
             $builder->addViewTransformer(new DateTimeToStringTransformer($options['model_timezone'], $options['view_timezone'], $format));
 
-            // handle seconds ignored by user's browser when with_seconds enabled
-            // https://codereview.chromium.org/450533009/
-            if ($options['with_seconds']) {
-                $builder->addEventListener(FormEvents::PRE_SUBMIT, function (FormEvent $e) {
-                    $data = $e->getData();
-                    if ($data && preg_match('/^\d{2}:\d{2}$/', $data)) {
-                        $e->setData($data.':00');
+            $builder->addEventListener(FormEvents::PRE_SUBMIT, function (FormEvent $e) use ($options) {
+                $data = $e->getData();
+                if ($data && preg_match('/^(?P<hours>\d{2}):(?P<minutes>\d{2})(?::(?P<seconds>\d{2})(?:\.\d+)?)?$/', $data, $matches)) {
+                    if ($options['with_seconds']) {
+                        // handle seconds ignored by user's browser when with_seconds enabled
+                        // https://codereview.chromium.org/450533009/
+                        $e->setData(sprintf('%s:%s:%s', $matches['hours'], $matches['minutes'], isset($matches['seconds']) ? $matches['seconds'] : '00'));
+                    } else {
+                        $e->setData(sprintf('%s:%s', $matches['hours'], $matches['minutes']));
                     }
-                });
-            }
+                }
+            });
         } else {
             $hourOptions = $minuteOptions = $secondOptions = [
                 'error_bubbling' => true,
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/Type/TimeTypeTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/Type/TimeTypeTest.php
index 1f0797f000db4..3a911de8fe99b 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/Type/TimeTypeTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/Type/TimeTypeTest.php
@@ -239,6 +239,54 @@ public function testSubmitWithSecondsAndBrowserOmissionSeconds()
         $this->assertEquals('03:04:00', $form->getViewData());
     }
 
+    public function testSubmitWithoutSecondsAndBrowserAddingSeconds()
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'model_timezone' => 'UTC',
+            'view_timezone' => 'UTC',
+            'input' => 'string',
+            'widget' => 'single_text',
+            'with_seconds' => false,
+        ]);
+
+        $form->submit('03:04:00');
+
+        $this->assertEquals('03:04:00', $form->getData());
+        $this->assertEquals('03:04', $form->getViewData());
+    }
+
+    public function testSubmitWithSecondsAndBrowserAddingMicroseconds()
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'model_timezone' => 'UTC',
+            'view_timezone' => 'UTC',
+            'input' => 'string',
+            'widget' => 'single_text',
+            'with_seconds' => true,
+        ]);
+
+        $form->submit('03:04:00.000');
+
+        $this->assertEquals('03:04:00', $form->getData());
+        $this->assertEquals('03:04:00', $form->getViewData());
+    }
+
+    public function testSubmitWithoutSecondsAndBrowserAddingMicroseconds()
+    {
+        $form = $this->factory->create(static::TESTED_TYPE, null, [
+            'model_timezone' => 'UTC',
+            'view_timezone' => 'UTC',
+            'input' => 'string',
+            'widget' => 'single_text',
+            'with_seconds' => false,
+        ]);
+
+        $form->submit('03:04:00.000');
+
+        $this->assertEquals('03:04:00', $form->getData());
+        $this->assertEquals('03:04', $form->getViewData());
+    }
+
     public function testSetDataWithoutMinutes()
     {
         $form = $this->factory->create(static::TESTED_TYPE, null, [

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