Easy way to convert timestamp to UTC object?

[amandasaurus]

As near as I can tell, the only way to convert a timestamp (i.e. number of seconds since UNIX epoch¹) is with NaiveDateTime::from_timestamp(), however that returns a DateTime without a timezone... but if we know the unix epoch time, then we know exactly what second it is? a timestamp of 60 is 00:01 UTC on 1st Jan 1970, it's not like it can be in a some other timezone.

How about some method that'll take a unix epoch and return a DateTime in UTC timezone?

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¹ I'm aware of leap seconds

[lifthrasiir]

@rory Wouldn't UTC.timestamp(secs, nanos) be enough for your use case?

[amandasaurus]

On 06/08/16 17:27, Kang Seonghoon wrote:

@rory https://github.com/rory Wouldn't |UTC.timestamp(secs, nanos)| be
enough for your use case?

D'oh! It looks like it might. I obviously didn't find that in the docs.
I was looking for from_timestamp, so that didn't come up. I'll try
that out. Thanks! 👍

[lifthrasiir]

@rory Great! Please close the issue if it worked :)

I was looking for from_timestamp, so that didn't come up.

Huh, that may be confusing indeed. I'll think more about that.

[lolgesten]

Cross references in the docs between DateTime::timestamp and Utc::timestamp would be gold.

[lolgesten]

uhm. strike that. can we actually go from Utc:: to a DateTime?

[quodlibetor]

All the methods on TimeZone are implemented on Utc, anything that has a type signature that ends with -> DateTime will convert a Utc to a DateTime. Sometimes you need to go by way of dates. So: Utc.ymd(2018, 1, 2).and_hms(1, 1, 1) will result in a DateTime.

[lolgesten]

Yes, I found it eventually. Thanks! In rust/chrono to convert millis UNIX epoch is:

    let millis = reader.get_time_stamp();
    let seconds = (millis / 1000) as i64;
    let nanos = ((millis % 1000) * 1_000_000) as u32;
    let time_stamp = DateTime::<Utc>::from_utc(NaiveDateTime::from_timestamp(seconds, nanos), Utc);

[quodlibetor]

TimeZone::timestamp will also work, and be less verbose:

let timestamp = Utc.timestamp(seconds, nanos);