Silverstripe DateField jQueryUI Datepicker with advanced configs

Silverstripe DateField advanced Datepicker

// add this to mysite/_config.php
Object::useCustomClass('DateField_View_JQuery', 'jQueryUIDateField_View'); 

// mysite/code/jQueryUIDateField_View.php
class jQueryUIDateField_View extends DateField_View_JQuery {
	function onBeforeRender() {
		$Field = $this->getField();
		$format = self::convert_iso_to_jquery_format($Field->getConfig('dateformat'));
		$conf = array(
			'dateFormat' => $format
		);
		
		if($Field->getConfig('showcalendar')) 
			$conf['showcalendar'] = true;
		if ($Field->getConfig('min')) 
			$conf['minDate'] = self::convert_iso_to_jquery_format($Field->getConfig('min'));
		if ($Field->getConfig('max')) 
			$conf['maxDate'] = self::convert_iso_to_jquery_format($Field->getConfig('max'));

		if (!empty($Field->jQueryConfig) && is_array($Field->jQueryConfig)) 
			foreach ($Field->jQueryConfig as $key=>$val)
			$conf[$key] = $val;
			
		if (!empty($Field->jQueryEvents) && is_array($Field->jQueryEvents)) {	
			$value_arr = array();
			$replace_keys = array();
			foreach($Field->jQueryEvents as $key => $value){
			    // Store function string.
			    $value_arr[] = $value;
			    // Replace function string in $foo with a 'unique' special key.
			    $value = '%' . $key . '%';
			    $conf[$key] = $value;
			    // Later on, we'll look for the value, and replace it.
			    $replace_keys[] = '"' . $value . '"';
			}
		}

		$conf = Convert::raw2json($conf);
		
		if (!empty($Field->jQueryEvents) && is_array($Field->jQueryEvents)) {
			// Replace the special keys with the original function.
			$conf = str_replace($replace_keys, $value_arr, $conf);
		}
			
		$conf = str_replace('"', '\'', $conf);

		$this->getField()->addExtraClass($conf);
	}
}

Allows you to set all jQuery UI options and events.
Usage:
$DateField = new DateField('myDate');
$DateField->jQueryConfig = array(
'changeMonth' => true,
'changeYear' => true
);
$DateField->jQueryEvents = array(
'beforeShowDay' => "function(date) { /* do something with date */ }"
);