/**
* Obtains a clock that returns the current instant using the best available
* system clock, converting to date and time using the default time-zone.
* <p>
* This clock is based on the best available system clock.
* This may use {@link System#currentTimeMillis()}, or a higher resolution
* clock if one is available.
* <p>
* Using this method hard codes a dependency to the default time-zone into your application.
* It is recommended to avoid this and use a specific time-zone whenever possible.
* The {@link #systemUTC() UTC clock} should be used when you need the current instant
* without the date or time.
* <p>
* The returned implementation is immutable, thread-safe and {@code Serializable}.
* It is equivalent to {@code system(ZoneId.systemDefault())}.
*
* @return Clock clock that uses the best available system clock in the default zone, not null
* @see ZoneId#systemDefault()
*/
public static function systemDefaultZone()
{
return new SystemClock(ZoneId::systemDefault());
}
public function test_systemDefault()
{
$test = ZoneId::systemDefault();
$this->assertEquals($test->getId(), date_default_timezone_get());
}