diff --git a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToStringTransformer.php b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToStringTransformer.php
index 56dee3502787..daeee5cce779 100644
--- a/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToStringTransformer.php
+++ b/src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToStringTransformer.php
@@ -40,15 +40,6 @@ class DateTimeToStringTransformer extends BaseDateTimeTransformer
      */
     private $parseFormat;
 
-    /**
-     * Whether to parse by appending a pipe "|" to the parse format.
-     *
-     * This only works as of PHP 5.3.7.
-     *
-     * @var bool
-     */
-    private $parseUsingPipe;
-
     /**
      * Transforms a \DateTime instance to a string.
      *
@@ -57,18 +48,15 @@ class DateTimeToStringTransformer extends BaseDateTimeTransformer
      * @param string $inputTimezone  The name of the input timezone
      * @param string $outputTimezone The name of the output timezone
      * @param string $format         The date format
-     * @param bool   $parseUsingPipe Whether to parse by appending a pipe "|" to the parse format
      *
      * @throws UnexpectedTypeException if a timezone is not a string
      */
-    public function __construct($inputTimezone = null, $outputTimezone = null, $format = 'Y-m-d H:i:s', $parseUsingPipe = true)
+    public function __construct($inputTimezone = null, $outputTimezone = null, $format = 'Y-m-d H:i:s')
     {
         parent::__construct($inputTimezone, $outputTimezone);
 
         $this->generateFormat = $this->parseFormat = $format;
 
-        $this->parseUsingPipe = $parseUsingPipe || null === $parseUsingPipe;
-
         // See http://php.net/manual/en/datetime.createfromformat.php
         // The character "|" in the format makes sure that the parts of a date
         // that are *not* specified in the format are reset to the corresponding
@@ -77,7 +65,7 @@ public function __construct($inputTimezone = null, $outputTimezone = null, $form
         // where the time corresponds to the current server time.
         // With "|" and "Y-m-d", "2010-02-03" becomes "2010-02-03 00:00:00",
         // which is at least deterministic and thus used here.
-        if ($this->parseUsingPipe && false === strpos($this->parseFormat, '|')) {
+        if (false === strpos($this->parseFormat, '|')) {
             $this->parseFormat .= '|';
         }
     }
@@ -147,70 +135,6 @@ public function reverseTransform($value)
         }
 
         try {
-            // On PHP versions < 5.3.7 we need to emulate the pipe operator
-            // and reset parts not given in the format to their equivalent
-            // of the UNIX base timestamp.
-            if (!$this->parseUsingPipe) {
-                list($year, $month, $day, $hour, $minute, $second) = explode('-', $dateTime->format('Y-m-d-H-i-s'));
-
-                // Check which of the date parts are present in the pattern
-                preg_match(
-                    '/('.
-                    '(?P<day>[djDl])|'.
-                    '(?P<month>[FMmn])|'.
-                    '(?P<year>[Yy])|'.
-                    '(?P<hour>[ghGH])|'.
-                    '(?P<minute>i)|'.
-                    '(?P<second>s)|'.
-                    '(?P<dayofyear>z)|'.
-                    '(?P<timestamp>U)|'.
-                    '[^djDlFMmnYyghGHiszU]'.
-                    ')*/',
-                    $this->parseFormat,
-                    $matches
-                );
-
-                // preg_match() does not guarantee to set all indices, so
-                // set them unless given
-                $matches = array_merge(array(
-                    'day' => false,
-                    'month' => false,
-                    'year' => false,
-                    'hour' => false,
-                    'minute' => false,
-                    'second' => false,
-                    'dayofyear' => false,
-                    'timestamp' => false,
-                ), $matches);
-
-                // Reset all parts that don't exist in the format to the
-                // corresponding part of the UNIX base timestamp
-                if (!$matches['timestamp']) {
-                    if (!$matches['dayofyear']) {
-                        if (!$matches['day']) {
-                            $day = 1;
-                        }
-                        if (!$matches['month']) {
-                            $month = 1;
-                        }
-                    }
-                    if (!$matches['year']) {
-                        $year = 1970;
-                    }
-                    if (!$matches['hour']) {
-                        $hour = 0;
-                    }
-                    if (!$matches['minute']) {
-                        $minute = 0;
-                    }
-                    if (!$matches['second']) {
-                        $second = 0;
-                    }
-                    $dateTime->setDate($year, $month, $day);
-                    $dateTime->setTime($hour, $minute, $second);
-                }
-            }
-
             if ($this->inputTimezone !== $this->outputTimezone) {
                 $dateTime->setTimezone(new \DateTimeZone($this->inputTimezone));
             }
diff --git a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateTimeToStringTransformerTest.php b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateTimeToStringTransformerTest.php
index 883634985a2f..e2389ebf003a 100644
--- a/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateTimeToStringTransformerTest.php
+++ b/src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateTimeToStringTransformerTest.php
@@ -120,21 +120,9 @@ public function testTransformExpectsDateTime()
     /**
      * @dataProvider dataProvider
      */
-    public function testReverseTransformUsingPipe($format, $input, $output)
+    public function testReverseTransform($format, $input, $output)
     {
-        $reverseTransformer = new DateTimeToStringTransformer('UTC', 'UTC', $format, true);
-
-        $output = new \DateTime($output);
-
-        $this->assertDateTimeEquals($output, $reverseTransformer->reverseTransform($input));
-    }
-
-    /**
-     * @dataProvider dataProvider
-     */
-    public function testReverseTransformWithoutUsingPipe($format, $input, $output)
-    {
-        $reverseTransformer = new DateTimeToStringTransformer('UTC', 'UTC', $format, false);
+        $reverseTransformer = new DateTimeToStringTransformer('UTC', 'UTC', $format);
 
         $output = new \DateTime($output);