如何以毫秒为单位获取当前时间? [英] How can I get the current time in milliseconds?

问题描述

如何像在 Java 中一样以毫秒为单位获取当前时间?

How can I get the current time in milliseconds like I can in Java?

System.currentTimeMillis()

推荐答案

从 Rust 1.8 开始，你不需要使用 crate.相反，您可以使用 SystemTime和 UNIX_EPOCH:

Since Rust 1.8, you do not need to use a crate. Instead, you can use SystemTime and UNIX_EPOCH:

use std::time::{SystemTime, UNIX_EPOCH};

fn main() {
    let start = SystemTime::now();
    let since_the_epoch = start
        .duration_since(UNIX_EPOCH)
        .expect("Time went backwards");
    println!("{:?}", since_the_epoch);
}

如果你需要精确的毫秒，你可以转换Duration.

If you need exactly milliseconds, you can convert the Duration.

let in_ms = since_the_epoch.as_millis();

Rust 1.27

let in_ms = since_the_epoch.as_secs() as u128 * 1000 + 
            since_the_epoch.subsec_millis() as u128;

Rust 1.8

let in_ms = since_the_epoch.as_secs() * 1000 +
            since_the_epoch.subsec_nanos() as u64 / 1_000_000;

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