[Form] The declaration and initialization (constructor) of the variables should be in the same class.

src/Symfony/Component/Form/DataTransformer/BaseDateTimeTransformer.php

@@ -13,10 +13,7 @@ namespace Symfony\Component\Form\DataTransformer;
 
 abstract class BaseDateTimeTransformer implements DataTransformerInterface
 {
-    protected $inputTimezone;
-
-    protected $outputTimezone;
-
+    
     protected static $formats = array(
         \IntlDateFormatter::NONE,
         \IntlDateFormatter::FULL,

src/Symfony/Component/Form/DataTransformer/DateTimeToArrayTransformer.php

@@ -28,6 +28,10 @@ use Symfony\Component\Form\Exception\UnexpectedTypeException;
 class DateTimeToArrayTransformer extends BaseDateTimeTransformer
 {
 
+    private $inputTimezone;
+
+    private $outputTimezone;
+
     private $pad;
 
     private $fields;

src/Symfony/Component/Form/DataTransformer/DateTimeToLocalizedStringTransformer.php

@@ -28,6 +28,10 @@ use Symfony\Component\Form\Exception\UnexpectedTypeException;
 class DateTimeToLocalizedStringTransformer extends BaseDateTimeTransformer
 {
 
+    private $inputTimezone;
+
+    private $outputTimezone;
+    
     private $dateFormat;
 
     private $timeFormat;