SimpleMachines / SMF2.1

	// Define the timezone for this event, falling back to the default if not provided

	if (!empty($eventOptions['tz']) && in_array($eventOptions['tz'], timezone_identifiers_list(DateTimeZone::ALL_WITH_BC)))

		$tz = $eventOptions['tz'];

	elseif (!empty($_POST['tz']) && in_array($_POST['tz'], timezone_identifiers_list(DateTimeZone::ALL_WITH_BC)))

		$tz = $_POST['tz'];

	else

		$tz = getUserTimezone();

		$smcFunc['db_free_result']($request);

	}

	if (empty($timezone) || !in_array($timezone, timezone_identifiers_list(DateTimeZone::ALL_WITH_BC)))

		$timezone = isset($modSettings['default_timezone']) ? $modSettings['default_timezone'] : date_default_timezone_get();

	return $timezone;

}