Parse unixtime in Rust

time_parse.rs

use std::env;
use chrono::prelude::DateTime;

fn main() {
    let args: Vec<String> = env::args().collect();
    if args.len() < 2 {
        println!("argument is unixtime");
        return;
    }

    let unixtime = &args[1];
    let pretty = pretty_format(unixtime);
    println!("{}", pretty);

    // let utc_datetime: DateTime<Utc> = Utc::now();
    // let utc_date: Date<Utc> = Utc::today();

    // println!("{}", utc_datetime);
    // println!("{}", utc_date);

    // let local_datetime: DateTime<Local> = Local::now();
    // let local_date: Date<Local> = Local::today();

    // println!("{}", local_datetime);
    // println!("{}", local_date);

    // let dt = DateTime::parse_from_str(
    //     "1983 Apr 13 12:09:14.274 +0000", "%Y %b %d %H:%M:%S%.3f %z");
    // println!("{}", dt.unwrap());

    // let dt = NaiveDateTime::parse_from_str("1651713139", "%s");
    // println!("{}", dt.unwrap());

    // let dt = DateTime::parse_from_str("1651713139 +0900", "%s %z");
    // println!("{}", dt.unwrap());
}

fn pretty_format(unixtime: &String) -> String {
    // println!("pretty_format: unixtime: {}", unixtime);
    let unixtime = format!("{} +0900", unixtime);
    match DateTime::parse_from_str(unixtime.as_str(), "%s %z") {
        Ok(t) => t.to_string(),
        Err(e) => panic!("error: {:?}", e),
    }
}