clarify the datetime format option

xabbuh · xabbuh · commit ff33ed227986 · 2018-10-04T12:07:11.000+02:00
diff --git a/reference/forms/types/datetime.rst b/reference/forms/types/datetime.rst
@@ -112,10 +112,10 @@ format
 
 If the ``widget`` option is set to ``single_text``, this option specifies
 the format of the input, i.e. how Symfony will interpret the given input
-as a datetime string. It defaults to the `RFC 3339`_ format which is used
-by the HTML5 ``datetime`` field. Keeping the default value will cause the
-field to be rendered as an ``input`` field with ``type="datetime"``. For
-more information on valid formats, see `Date/Time Format Syntax`_.
+as a datetime string. It defaults to the `datetime local`_ format which is
+used by the HTML5 ``datetime-local`` field. Keeping the default value will
+cause the field to be rendered as an ``input`` field with ``type="datetime-local"``.
+For more information on valid formats, see `Date/Time Format Syntax`_.
 
 .. include:: /reference/forms/types/options/hours.rst.inc
 
@@ -221,5 +221,5 @@ Field Variables
 |          |            | contains the input type to use (``datetime``, ``date`` or ``time``). |
 +----------+------------+----------------------------------------------------------------------+
 
-.. _`RFC 3339`: https://tools.ietf.org/html/rfc3339
+.. _`datetime local`: http://w3c.github.io/html-reference/datatypes.html#form.data.datetime-local
 .. _`Date/Time Format Syntax`: http://userguide.icu-project.org/formatparse/datetime#TOC-Date-Time-Format-Syntax
