Detecting system timezone

[jan-hudec]

Would detecting system timezone be appropriate addition to chrono-tz?

The chrono package has LocalTimezone, but that only knows current offset and not the daylight-saving rules, so it is not sufficient for many calculations. And detecting the exact timezone is not trivial. I have found a code for it in ICU (uprv_tzname and related functions) and intend to port it to Rust.

Should this be added to chrono-tz? I think it makes sense there.

[pitdicker]

The iana-time-zone crate offers this functionality. We could mention it in our documentation.