added doc and fixed CS for previous merge

doc/templates.rst

@@ -1115,6 +1115,9 @@ List of built-in Filters
 ``date``
 ~~~~~~~~
 
+.. versionadded:: 1.1
+    The timezone support has been added in Twig 1.1.
+
 The ``date`` filter is able to format a date to a given format:
 
 .. code-block:: jinja
@@ -1135,6 +1138,10 @@ To escape words and characters in the date format use ``\\`` in front of each ch
 
     {{ post.published_at|date("F jS \\a\\t g:ia") }}
 
+You can also specify a timezone:
+
+    {{ post.published_at|date("m/d/Y", "Europe/Paris") }}
+
 ``format``
 ~~~~~~~~~~
 

lib/Twig/Extension/Core.php

@@ -201,7 +201,7 @@ class Twig_Extension_Core extends Twig_Extension
     }
 }
 
-function twig_date_format_filter($date, $format = 'F j, Y H:i', $timezone = NULL)
+function twig_date_format_filter($date, $format = 'F j, Y H:i', $timezone = null)
 {
     if (!$date instanceof DateTime) {
         if (ctype_digit((string) $date)) {
@@ -212,7 +212,7 @@ function twig_date_format_filter($date, $format = 'F j, Y H:i', $timezone = NULL
         }
     }
 
-    if ($timezone !== NULL) {
+    if (null !== $timezone) {
         if (!$timezone instanceof DateTimeZone) {
             $timezone = new DateTimeZone($timezone);
         }