一種是采用系統(tǒng)庫timestamp1，一種是采用第三方庫timestamp2，但是由于time庫已經(jīng)不在維護(hù)，所以推薦使用官方庫。

目前rust的時(shí)間庫為chrone

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

extern crate time;

fn timestamp2() -> i64 {
    let timespec = time::get_time();
    timespec.sec * 1000 + (timespec.nsec as f64 / 1000.0 / 1000.0) as i64
}

fn timestamp1() -> i64 {
    let start = SystemTime::now();
    let since_the_epoch = start
        .duration_since(UNIX_EPOCH)
        .expect("Time went backwards");
    let ms = since_the_epoch.as_secs() as i64 * 1000i64 + (since_the_epoch.subsec_nanos() as f64 / 1_000_000.0) as i64;
    ms
}

fn main() {
    let ts1 = timestamp1();
    println!("TimeStamp1: {}", ts1);
    let ts2 = timestamp2();
    println!("TimeStamp2: {}", ts2);
}

不過雖然time庫不在維護(hù)，又出現(xiàn)一個(gè)新的時(shí)間庫chrone
而且用法更簡(jiǎn)單，推薦如下這種方式

use chrono::prelude::*;

extern crate chrono;

fn main() {
    let dt = Local::now();
    println!("dt: {}", dt);
    println!("dt: {}", dt.timestamp_millis());
}

官網(wǎng)地址：https://github.com/chronotope/chrono/