[Joomla] Creating date input field with datepicker

datepicker.php

<?php

/**
 * Joomla - Creating date input field with datepicker
 *
 * @package joomla
 *
 * @param $value   - initial field value
 * @param $name    - field name
 * @param $id      - input tag id (required by datepicker)
 * @param $format  - http://www.php.net/manual/en/function.date.php
 * @param $attribs - associative array of HTML input tag attributes
 */

echo JHTML::_('behavior.calendar');
echo JHTML::_('calendar', $value, $name, $id, $format, $attribs);