Rust Chrono (时间处理)

.rs

use chrono::{DateTime, Datelike, Local, TimeDelta};
use std::{error::Error, thread::sleep, time::Duration};

fn main() -> Result<(), Box<dyn Error>> {

    println!("{:#X}", 250);

    let dt = Local::now();
    println!("now: {}", dt.format("%Y/%m/%d %H:%M %A"));
    let dt = match dt.checked_add_signed(TimeDelta::days(66)) {
        Some(d) => d,
        _ => panic!("error days"),
    };
    println!("after move 66 days: {},  {}", dt.format("%Y/%m/%d %H:%M %A"), dt.format("%Y-%m-%d"));

    let next = match DateTime::parse_from_str("2025-11-01 00:00 +0800", "%Y-%m-%d %H:%M %z") {
        Ok(d) => d.with_timezone(&dt.timezone()),
        Err(e) => panic!("error dist time {}", e),
    };
    println!("next apply timezone: {}", next.format("%Y/%m/%d %H:%M %A"));
    println!("UNIX TIME: {}", next.format("%s"));
    println!(
        "到 {} 还有天数：{} 当天应该是星期：{}",
        next.format("%Y/%m/%d %H:%M %A %:::z"),
        next.signed_duration_since(dt).num_days(),
        next.weekday()
    );

    println!(
        "straightly {}",
        match DateTime::parse_from_str("1738339200", "%s") {
            Ok(d) => d.signed_duration_since(Local::now()).num_days(),
            _ => -1,
        }
    );

    println!("{} /= {:?}", Local::now(), Local::now().date_naive());
    let before = Local::now();
    sleep(Duration::from_secs(5));
    let after = Local::now();

    println!("<{}> compare with <{}> is {:?}", before.naive_local(), after.naive_local(), before.cmp(&after));

    Ok(())
}