added a way to change the default format for the date filter

CHANGELOG

@@ -1,5 +1,6 @@
 * 1.5.0
 
+ * added a way to change the default format for the date filter
  * fixed the lexer when an operator ending with a letter ends a line
  * added string interpolation support
  * enhanced exceptions for unknown filters, functions, tests, and tags

doc/filters/date.rst

@@ -4,6 +4,9 @@
 .. versionadded:: 1.1
     The timezone support has been added in Twig 1.1.
 
+.. versionadded:: 1.5
+    The default date format support has been added in Twig 1.5.
+
 The ``date`` filter formats a date to a given format:
 
 .. code-block:: jinja
@@ -30,5 +33,13 @@ You can also specify a timezone:
 
     {{ post.published_at|date("m/d/Y", "Europe/Paris") }}
 
+If no format is provided, Twig will use the default one: ``F j, Y H:i``. This
+default can be easily changed:
+
+.. code-block:: php
+
+    $twig = new Twig_Environment($loader);
+    $twig->getExtension('core')->setDateFormat('d/m/Y');
+
 .. _`date`:     http://www.php.net/date
 .. _`DateTime`: http://www.php.net/manual/en/datetime.construct.php

lib/Twig/Extension/Core.php

@@ -14,6 +14,28 @@ if (!defined('ENT_SUBSTITUTE')) {
  */
 class Twig_Extension_Core extends Twig_Extension
 {
+    protected $dateFormat = 'F j, Y H:i';
+
+    /**
+     * Sets the default format to be used by the date filter.
+     *
+     * @param string $format The default date format string
+     */
+    public function setDateFormat($format)
+    {
+        $this->dateFormat = $format;
+    }
+
+    /**
+     * Gets the default format to be used by the date filter.
+     *
+     * @return string The default date format string
+     */
+    public function getDateFormat()
+    {
+        return $this->dateFormat;
+    }
+
     /**
      * Returns the token parser instance to add to the existing list.
      *
@@ -46,7 +68,7 @@ class Twig_Extension_Core extends Twig_Extension
     {
         $filters = array(
             // formatting filters
-            'date'    => new Twig_Filter_Function('twig_date_format_filter'),
+            'date'    => new Twig_Filter_Function('twig_date_format_filter', array('needs_environment' => true)),
             'format'  => new Twig_Filter_Function('sprintf'),
             'replace' => new Twig_Filter_Function('strtr'),
 
@@ -228,14 +250,19 @@ function twig_cycle($values, $i)
  *   {{ post.published_at|date("m/d/Y") }}
  * </pre>
  *
+ * @param Twig_Environment    $env      A Twig_Environment instance
  * @param DateTime|string     $date     A date
  * @param string              $format   A format
  * @param DateTimeZone|string $timezone A timezone
  *
  * @return string The formatter date
  */
-function twig_date_format_filter($date, $format = 'F j, Y H:i', $timezone = null)
+function twig_date_format_filter(Twig_Environment $env, $date, $format = null, $timezone = null)
 {
+    if (null === $format) {
+        $format = $env->getExtension('core')->getDateFormat();
+    }
+
     if (!$date instanceof DateTime && !$date instanceof DateInterval) {
         $asString = (string) $date;
         if (ctype_digit($asString) || (!empty($asString) && '-' === $asString[0] && ctype_digit(substr($asString, 1)))) {

test/Twig/Tests/Fixtures/filters/date_default_format.test

@@ -0,0 +1,14 @@
+--TEST--
+"date" filter
+--TEMPLATE--
+{{ date|date }}
+{{ date|date('d/m/Y') }}
+--DATA--
+date_default_timezone_set('UTC');
+$twig->getExtension('core')->setDateFormat('Y-m-d');
+return array(
+    'date' => mktime(13, 45, 0, 10, 4, 2010),
+)
+--EXPECT--
+2010-10-04
+04/10/2010