Validator.php
protected function _validateAfterWithFormat($format, $value, $parameters)
    {
        $param = $this->_getValue($parameters[0]) ?: $parameters[0];

        return $this->_checkDateTimeOrder($format, $param, $value);
    }
protected function _validateAfterWithFormat($format, $value, $parameters)
    {
        $param = $this->_getValue($parameters[0]) ?: $parameters[0];

        return $this->_checkDateTimeOrder($format, $param, $value);
    }
Validate the date is after a given date with a given format.

@param  string  $format
@param  mixed   $value
@param  array   $parameters
@return bool