According to readme, when using parameter includeUtc, utc time zone can be found under UTC:

However, through trial and error, I found out it is actually Etc/UTC and not just UTC:

https://codesandbox.io/s/suspicious-david-945pw3?file=/src/App.tsx

Is it supposed to be UTC or Etc/UTC? If it's the second, I can submit PR to update docs.