Timezone at specified time

[Sytten]

Hi there 👋
I am trying to move away from usage of localtime_r and I stubbled on this library from the chrono implementation and the recommendation from tz-rs.
I use the time crate local_offset_at a lot and it seems like it was reimplemented in chrono either with find_local_time_type_from_local for unix or a custom implementation for windows (https://github.com/chronotope/chrono/pull/677/files).
I am wondering if that could be something to be added in this library or not?
Thanks!

[Sytten]

Ok I think I was really confused, you just need a very simple wrapper function to use the local timezone function, transform it to an utc offset and apply it to your timezone. I don't think there is a need to add it to this lib, but an example using the time crate could be cool. I am trying to push the dev to move toward a rust implementation: time-rs/time#493

[Kijewski]

Hi Émile! So, you want to project a timestamp into the local time zone? Then tz::UtcDateTime::project() and/or tz::DateTime::project() should be what you are looking for:

let tz = tzdb::local_tz().unwrap();
let utc_ts = tz::UtcDateTime::new(2022, 8, 8, 14, 49, 33, 369777135).unwrap();
let local_ts = utc_ts.project(tz).unwrap();
dbg!(
    // "2022-08-08T14:49:33.369777135Z"
    utc_ts.to_string(),
    // "2022-08-08T16:49:33.369777135+02:00"
    local_ts.to_string(),
    // "CEST"
    local_ts.local_time_type().time_zone_designation(),
    // 7200
    local_ts.local_time_type().ut_offset(),
);

[Sytten]

Mainly wanted it to work with the time crate, I published my implementation on the linked issue. Thanks for the reply though!