/**
* Gets the system default time-zone.
* <p>
* This queries {@link TimeZone#getDefault()} to find the default time-zone
* and converts it to a {@code ZoneId}. If the system default time-zone is changed,
* then the result of this method will also change.
*
* @return ZoneId the zone ID, not null
* @throws DateTimeException if the converted zone ID has an invalid format
* @throws ZoneRulesException if the converted zone region ID cannot be found
*/
public static function systemDefault()
{
return ZoneId::_of(date_default_timezone_get(), true);
}
