code: public function setEmptyEndTime($varValue, Contao\DataContainer $dc)
  	{
  		if ($varValue === null)
  		{
  			$varValue = $dc->activeRecord->startTime;
  		}
  
  		return $varValue;
  	}
docs: Automatically set the end time if not set
  
  @param mixed                $varValue
  @param Contao\DataContainer $dc
  
  @return string