--- /dev/null
+``date_modify``
+===============
+
+.. versionadded:: 1.9.0
+ The date_modify filter has been added in Twig 1.9.0.
+
+The ``date_modify`` filter modifies a date with a given modifier string:
+
+.. code-block:: jinja
+
+ {{ post.published_at|date_modify("+1 day")|date("m/d/Y") }}
+
+The ``date_modify`` filter accepts strings (it must be in a format supported
+by the `strtotime`_ function) or `DateTime`_ instances. You can easily combine
+it with the :doc:`date<date>` filter for formatting.
+
+Arguments
+---------
+
+* ``modifier``: The modifier
+
+.. _`strtotime`: http://www.php.net/strtotime
+.. _`DateTime`: http://www.php.net/DateTime