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// date field
$fields['date'] = array(
'css' => 'my_datepicker', // would exists at fuel/assets/css/my_datepicker.css
'js' => array('jquery.datepicker.min'), // would exists at fuel/assets/js/jquery.datepicker.min.css
'css_class' => 'datepicker', // CSS class you want to automatically associate with the field which you can subsequently use in your "js_function" below
'js_function' => 'fuel.fields.datetime_field',