How to get epoch time in Rust?

Question

How can I get the current system epoch time (https://en.wikipedia.org/wiki/Unix_time) in milliseconds/seconds (and to a lesser extent nanoseconds and microseconds) in Rust?

J · Answer

To get the current epoch time in Rust you can use SystemTime::now() (https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.now) along with .duration_since (https://doc.rust-lang.org/std/time/struct.SystemTime.html#method.duration_since) and UNIX_EPOCH (https://doc.rust-lang.org/std/time/constant.UNIX_EPOCH.html).

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

fn main() {
    let now = SystemTime::now();
    let duration_since_epoch = now.duration_since(UNIX_EPOCH).expect("Time before UNIX_EPOCH");

let nanos: u128 = duration_since_epoch.as_nanos();
    let micros: u128 = duration_since_epoch.as_micros();
    // These two are probably what most are looking for
    let millis: u128 = duration_since_epoch.as_millis();
    let secs: u64 = duration_since_epoch.as_secs();

println!("Epoch time in nanoseconds: {}, microseconds: {}, milliseconds: {}, seconds: {}", nanos, micros, millis, secs);
}

Also, if you are trying to measure elapsed time for benchmarking (or some similar use case), you may want to consider using Rust's Instant (https://doc.rust-lang.org/std/time/struct.Instant.html) over SystemTime.

How to get epoch time in Rust?

Comments

Comments

Your Answer