TimeHelper::createTimezoneByOffset

public function createTimezoneByOffset($offsetSeconds)
{
	$offsetSeconds = (int)$offsetSeconds;
	static $timezonesByOffset = [];
	if (!isset($timezonesByOffset[$offsetSeconds]))
	{
		$timezonesByOffset[$offsetSeconds] = new DateTimeZone($this->getFormattedOffset($offsetSeconds));
	}
	return $timezonesByOffset[$offsetSeconds];
}