/**
  * get_local_timezone method
  *
  * Get applicable timezone name.
  * First attempt is to check current user prefference.
  * If that fails - global timezone offset is checked.
  * If no timezone is used - {@see $default} is assumed.
  *
  * @param string $default Fallback timezone name [optional=America/Los_Angeles]
  *
  * @return string Timezone identifier
  */
 public function get_local_timezone($default = 'America/Los_Angeles')
 {
     return Ai1ec_Time_Utility::get_local_timezone($default);
 }