instead of duplicating this and previous line against existing logic, exact original logic similar to:

```ruby

def zones
  @zones ||= find_zones
end

def us_zones
  @us_zones ||= find_us_zones
end

private

def find_zones
  @zones = zones_map.values.sort!
end

def find_us_zones
  all.find_all { |z| z.name =~ /US|Arizona|Indiana|Hawaii|Alaska/ } if rails_tz_name =~ /US|Arizona|Indiana|Hawaii|Alaska/
end
```

Then you can just call `@zones = find_zones` and `@us_zones = find_us_zones` in this method, and original behaviour would be preserved.