/**
* Outputs this date-time as a {@code String}, such as
* {@code 2007-12-03T10:15:30+01:00[Europe/Paris]}.
* <p>
* The format consists of the {@code LocalDateTime} followed by the {@code ZoneOffset}.
* If the {@code ZoneId} is not the same as the offset, then the ID is output.
* The output is compatible with ISO-8601 if the offset and ID are the same.
*
* @return string a string representation of this date-time, not null
*/
public function __toString()
{
$str = $this->dateTime->__toString() . $this->offset->__toString();
// equals
if ($this->offset != $this->zone) {
$str .= '[' . $this->zone->__toString() . ']';
}
return $str;
}