Time since the epoch [Rust]

since_the_epoch.rs

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

fn main() {
    let a = time::get_time().sec;
    dbg!(&a);

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

    
}