Symfony date formats are hard coded to the core and the definition is located at lib/symfony/i18n/sfDateFormat.class.php

This is how Symfony handles the date format definitions:

<code>
  protected $tokens = array(
    'G'=>'Era',
    'y'=>'year',
    'M'=>'mon',
    'd'=>'mday',
    'h'=>'Hour12',
    'H'=>'hours',
    'm'=>'minutes',
    's'=>'seconds',
    'E'=>'wday',
    'D'=>'yday',
    'F'=>'DayInMonth',
    'w'=>'WeekInYear',
    'W'=>'WeekInMonth',
    'a'=>'AMPM',
    'k'=>'HourInDay',
    'K'=>'HourInAMPM',
    'z'=>'TimeZone'
  );
</code>


And here's the reformating to the Javascript language (used for popup Date plugin)

<code>
array('yyyy' => 'Y', 'yy'=>'y', 'MM' => 'm', 'M'=>'m', 'dd'=>'d', 'd'=>'e', 'HH'=>'H', 'H'=>'k', 'hh'=>'I', 'h'=>'l', 'mm'=>'M', 'ss'=>'S', 'a'=>'p')
</code>

To change the format of a date for the object_input_date_tag you need to use parameter 'format' => 'd-M-Y' in the options.\\
Example:
<code>
object_input_date_tag($sklad, 'getCreatedAt', array (
  'rich' => true,
  'withtime' => false,
  'calendar_button_img' => '/sf/sf_admin/images/date.png',
  'control_name' => 'sklad[created_at]',
  'format' => 'd-G-yy',
))
</code>

===== Links =====

[[http://cz2.php.net/date|PHP Date Formats]]\\
[[http://dev.mysql.com/doc/refman/5.0/en/date-and-time-functions.html|MySql Date Formats]]