diff --git a/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php b/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php
index b58bfb933..e1d8cd1f2 100644
--- a/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php
+++ b/lib/Doctrine/ORM/Internal/Hydration/AbstractHydrator.php
@@ -210,6 +210,7 @@ abstract class AbstractHydrator
 
                     case (isset($this->_rsm->scalarMappings[$key])):
                         $cache[$key]['fieldName'] = $this->_rsm->scalarMappings[$key];
+                        $cache[$key]['type']      = Type::getType($this->_rsm->typeMappings[$key]);
                         $cache[$key]['isScalar']  = true;
                         break;
 
@@ -232,6 +233,8 @@ abstract class AbstractHydrator
             }
 
             if (isset($cache[$key]['isScalar'])) {
+                $value = $cache[$key]['type']->convertToPHPValue($value, $this->_platform);
+                
                 $rowData['scalars'][$cache[$key]['fieldName']] = $value;
 
                 continue;
diff --git a/lib/Doctrine/ORM/Query/ResultSetMapping.php b/lib/Doctrine/ORM/Query/ResultSetMapping.php
index b35af474f..32aa298f1 100644
--- a/lib/Doctrine/ORM/Query/ResultSetMapping.php
+++ b/lib/Doctrine/ORM/Query/ResultSetMapping.php
@@ -71,6 +71,12 @@ class ResultSetMapping
      */
     public $scalarMappings = array();
 
+    /**
+     * @ignore
+     * @var array Maps column names in the result set to the alias/field type to use in the mapped result.
+     */
+    public $typeMappings = array();
+
     /**
      * @ignore
      * @var array Maps entities in the result set to the alias name to use in the mapped result.
@@ -296,12 +302,16 @@ class ResultSetMapping
      *
      * @param string $columnName The name of the column in the SQL result set.
      * @param string $alias The result alias with which the scalar result should be placed in the result structure.
+     * @param string $type The column type
+     *
      * @return ResultSetMapping This ResultSetMapping instance.
+     *
      * @todo Rename: addScalar
      */
-    public function addScalarResult($columnName, $alias)
+    public function addScalarResult($columnName, $alias, $type = null)
     {
         $this->scalarMappings[$columnName] = $alias;
+        $this->typeMappings[$columnName]   = $type ?: 'string';
 
         if ( ! $this->isMixed && $this->fieldMappings) {
             $this->isMixed = true;
diff --git a/lib/Doctrine/ORM/Query/SqlWalker.php b/lib/Doctrine/ORM/Query/SqlWalker.php
index 47263517c..f1ef94ff1 100644
--- a/lib/Doctrine/ORM/Query/SqlWalker.php
+++ b/lib/Doctrine/ORM/Query/SqlWalker.php
@@ -1084,8 +1084,10 @@ class SqlWalker implements TreeWalker
 
                 $col = $sqlTableAlias . '.' . $columnName;
 
+                $fieldType = $class->getTypeOfField($fieldName);
+
                 if (isset($class->fieldMappings[$fieldName]['requireSQLConversion'])) {
-                    $type = Type::getType($class->getTypeOfField($fieldName));
+                    $type = Type::getType($fieldType);
                     $col  = $type->convertToPHPValueSQL($col, $this->_conn->getDatabasePlatform());
                 }
 
@@ -1094,7 +1096,7 @@ class SqlWalker implements TreeWalker
                 $this->_scalarResultAliasMap[$resultAlias] = $columnAlias;
 
                 if ( ! $hidden) {
-                    $this->_rsm->addScalarResult($columnAlias, $resultAlias);
+                    $this->_rsm->addScalarResult($columnAlias, $resultAlias, $fieldType);
                     $this->_scalarFields[$dqlAlias][$fieldName] = $columnAlias;
                 }
                 break;
@@ -1118,7 +1120,8 @@ class SqlWalker implements TreeWalker
                 $this->_scalarResultAliasMap[$resultAlias] = $columnAlias;
 
                 if ( ! $hidden) {
-                    $this->_rsm->addScalarResult($columnAlias, $resultAlias);
+                    // We cannot resolve field type here; assume 'string'.
+                    $this->_rsm->addScalarResult($columnAlias, $resultAlias, 'string');
                 }
                 break;
 
@@ -1131,7 +1134,8 @@ class SqlWalker implements TreeWalker
                 $this->_scalarResultAliasMap[$resultAlias] = $columnAlias;
 
                 if ( ! $hidden) {
-                    $this->_rsm->addScalarResult($columnAlias, $resultAlias);
+                    // We cannot resolve field type here; assume 'string'.
+                    $this->_rsm->addScalarResult($columnAlias, $resultAlias, 'string');
                 }
                 break;
 
diff --git a/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC657Test.php b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC657Test.php
new file mode 100644
index 000000000..a0a10a1b7
--- /dev/null
+++ b/tests/Doctrine/Tests/ORM/Functional/Ticket/DDC657Test.php
@@ -0,0 +1,118 @@
+<?php
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+require_once __DIR__ . '/../../../TestInit.php';
+
+use Doctrine\Tests\Models\Generic\DateTimeModel;
+
+/**
+ * @group DDC-657
+ */
+class DDC657Test extends \Doctrine\Tests\OrmFunctionalTestCase
+{
+    const NS = 'Doctrine\Tests\Models\Generic';
+
+    protected function setUp()
+    {
+        $this->useModelSet('generic');
+        parent::setUp();
+
+        $this->loadFixtures();
+    }
+
+    public function testEntitySingleResult()
+    {
+        $query      = $this->_em->createQuery('SELECT d FROM ' . self::NS . '\DateTimeModel d');
+        $datetime   = $query->setMaxResults(1)->getSingleResult();
+
+        $this->assertTrue($datetime instanceof DateTimeModel);
+
+        $this->assertTrue($datetime->datetime instanceof \DateTime);
+        $this->assertTrue($datetime->time instanceof \DateTime);
+        $this->assertTrue($datetime->date instanceof \DateTime);
+    }
+
+    public function testScalarResult()
+    {
+        $query      = $this->_em->createQuery('SELECT d.id, d.time, d.date, d.datetime FROM ' . self::NS . '\DateTimeModel d ORDER BY d.date ASC');
+        $result     = $query->getScalarResult();
+
+        $this->assertCount(2,$result);
+
+        $this->assertEquals('11:11:11', $result[0]['time']);
+        $this->assertEquals('2010-01-01', $result[0]['date']);
+        $this->assertEquals('2010-01-01 11:11:11', $result[0]['datetime']);
+
+        $this->assertEquals('12:12:12', $result[1]['time']);
+        $this->assertEquals('2010-02-02', $result[1]['date']);
+        $this->assertEquals('2010-02-02 12:12:12', $result[1]['datetime']);
+    }
+
+    public function testaTicketEntityArrayResult()
+    {
+        $query      = $this->_em->createQuery('SELECT d FROM ' . self::NS . '\DateTimeModel d ORDER BY d.date ASC');
+        $result     = $query->getArrayResult();
+
+        $this->assertCount(2,$result);
+
+        $this->assertTrue($result[0]['datetime'] instanceof \DateTime);
+        $this->assertTrue($result[0]['time'] instanceof \DateTime);
+        $this->assertTrue($result[0]['date'] instanceof \DateTime);
+
+        $this->assertTrue($result[1]['datetime'] instanceof \DateTime);
+        $this->assertTrue($result[1]['time'] instanceof \DateTime);
+        $this->assertTrue($result[1]['date'] instanceof \DateTime);
+    }
+
+    public function testTicketSingleResult()
+    {
+        $query      = $this->_em->createQuery('SELECT d.id, d.time, d.date, d.datetime FROM ' . self::NS . '\DateTimeModel d ORDER BY d.date ASC');
+        $datetime   = $query->setMaxResults(1)->getSingleResult();
+
+        $this->assertTrue(is_array($datetime));
+
+        $this->assertTrue($datetime['datetime'] instanceof \DateTime);
+        $this->assertTrue($datetime['time'] instanceof \DateTime);
+        $this->assertTrue($datetime['date'] instanceof \DateTime);
+    }
+
+    public function testTicketResult()
+    {
+        $query      = $this->_em->createQuery('SELECT d.id, d.time, d.date, d.datetime FROM ' . self::NS . '\DateTimeModel d ORDER BY d.date ASC');
+        $result     = $query->getResult();
+
+        $this->assertCount(2,$result);
+
+        $this->assertTrue($result[0]['time'] instanceof \DateTime);
+        $this->assertTrue($result[0]['date'] instanceof \DateTime);
+        $this->assertTrue($result[0]['datetime'] instanceof \DateTime);
+        $this->assertEquals('2010-01-01 11:11:11', $result[0]['datetime']->format('Y-m-d G:i:s'));
+
+        $this->assertTrue($result[1]['time'] instanceof \DateTime);
+        $this->assertTrue($result[1]['date'] instanceof \DateTime);
+        $this->assertTrue($result[1]['datetime'] instanceof \DateTime);
+        $this->assertEquals('2010-02-02 12:12:12', $result[1]['datetime']->format('Y-m-d G:i:s'));
+    }
+
+    public function loadFixtures()
+    {
+        $timezone           = new \DateTimeZone('America/Sao_Paulo');
+
+        $dateTime1          = new DateTimeModel();
+        $dateTime2          = new DateTimeModel();
+
+        $dateTime1->date    = new \DateTime('2010-01-01', $timezone);
+        $dateTime1->time    = new \DateTime('2010-01-01 11:11:11', $timezone);
+        $dateTime1->datetime= new \DateTime('2010-01-01 11:11:11', $timezone);
+
+        $dateTime2->date    = new \DateTime('2010-02-02', $timezone);
+        $dateTime2->time    = new \DateTime('2010-02-02 12:12:12', $timezone);
+        $dateTime2->datetime= new \DateTime('2010-02-02 12:12:12', $timezone);
+
+        $this->_em->persist($dateTime1);
+        $this->_em->persist($dateTime2);
+
+        $this->_em->flush();
+    }
+}
\ No newline at end of file