/**
* Find clock diff between server and API server, and store the diff locally.
*
* @return bool|int False if clock diff didn't change, otherwise returns the clock diff in seconds.
*/
private function _sync_clock_diff()
{
$this->_logger->entrance();
// Sync clock and store.
$new_clock_diff = $this->_api->FindClockDiff();
if ($new_clock_diff === self::$_clock_diff) {
return false;
}
// Update API clock's diff.
$this->_api->SetClockDiff(self::$_clock_diff);
// Store new clock diff in storage.
self::$_options->set_option('api_clock_diff', self::$_clock_diff, true);
return $new_clock_diff;
}