/**
* Outputs this date-time as a {@code String}, such as {@code 2007-12-03T10:15:30}.
* <p>
* The output will be one of the following ISO-8601 formats:
* <ul>
* <li>{@code uuuu-MM-dd'T'HH:mm}</li>
* <li>{@code uuuu-MM-dd'T'HH:mm:ss}</li>
* <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSS}</li>
* <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSS}</li>
* <li>{@code uuuu-MM-dd'T'HH:mm:ss.SSSSSSSSS}</li>
* </ul>
* The format used will be the shortest that outputs the full value of
* the time where the omitted parts are implied to be zero.
*
* @return string a string representation of this date-time, not null
*/
public function __toString()
{
return $this->date->__toString() . 'T' . $this->time->__toString();
}
