如何使用 chrono 处理 Unix 时间戳？

Question

我似乎无法弄清楚如何使用 Rust 处理 Unix 时间戳chrono。

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我有以下代码，但是naive和 因此datetime变量不正确：

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use chrono::{Utc, DateTime, NaiveDateTime};\n\nfn main() {\n    println!("Hello, world!");\n\n    let timestamp = "1627127393230".parse::<i64>().unwrap();\n    let naive = NaiveDateTime::from_timestamp(timestamp, 0);\n    let datetime: DateTime<Utc> = DateTime::from_utc(naive, Utc);\n\n    println!("timestamp: {}", timestamp);\n    println!("naive: {}", naive);\n    println!("datetime: {}", datetime);\n}\n\n

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输出：

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use chrono::{Utc, DateTime, NaiveDateTime};\n\nfn main() {\n    println!("Hello, world!");\n\n    let timestamp = "1627127393230".parse::<i64>().unwrap();\n    let naive = NaiveDateTime::from_timestamp(timestamp, 0);\n    let datetime: DateTime<Utc> = DateTime::from_utc(naive, Utc);\n\n    println!("timestamp: {}", timestamp);\n    println!("naive: {}", naive);\n    println!("datetime: {}", datetime);\n}\n\n

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当正确的日期时间1627127393230是：

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GMT: Saturday, July 24, 2021 11:49:53.230 AM

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有人可以告诉我我在这里缺少什么吗？

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---

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最终解决方案：

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use chrono::{DateTime, Utc, NaiveDateTime};\n\npub fn convert(timestamp: i64)  -> DateTime<Utc> {\n    let naive = NaiveDateTime::from_timestamp_opt(timestamp / 1000, (timestamp % 1000) as u32 * 1_000_000).unwrap();\n    DateTime::<Utc>::from_utc(naive, Utc)\n}\n\n\n#[test]\nfn test_timestamp() {\n    let timestamp = 1627127393230;\n    let ts = convert(timestamp);\n    assert_eq!(ts.to_string(), "2021-07-24 11:49:53.230 UTC")\n}\n\n

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Answer 1

from_timestamp 不支持毫秒。您可以将第二个参数中的毫秒作为纳秒。但你必须将其从时间戳中分离出来。

检查子字符串箱或这样做：

use chrono::{DateTime, NaiveDateTime, Utc}; 

fn main() {
    let timestamp = 1627127393i64;
    let nanoseconds = 230 * 1000000;
    let datetime = DateTime::<Utc>::from_utc(NaiveDateTime::from_timestamp(timestamp, nanoseconds), Utc);
    println!("{}", datetime);
}

使用子字符串箱：

use substring::Substring;
use chrono::{DateTime, NaiveDateTime, Utc}; 

fn main() {
    let timestamp = "1627127393230";
    let nanoseconds = substring(timestamp, 11, 3).parse::<i64>().unwrap() * 1000000;
    let timestamp = substring(timestamp, 1, 10).parse::<i64>().unwrap();
    let datetime = DateTime::<Utc>::from_utc(NaiveDateTime::from_timestamp(timestamp, nanoseconds), Utc);
    println!("{}", datetime);
}