Rust  利用 chrono 库实现日期和字符串互相转换的示例

[dependencies]
chrono = { version = "0.4", features = ["serde"] }

use chrono::{Local, DateTime, Utc};
fn main() {
    // 获取当前时间（UTC时间）
    let now_utc: DateTime<Utc> = Utc::now();
    // 将日期时间转换为字符串
    let formatted_utc = now_utc.format("%Y-%m-%d %H:%M:%S").to_string();
    println!("UTC Time: {}", formatted_utc);
    // 获取当前时间（本地时间）
    let now_local: DateTime<Local> = Local::now();
    // 将日期时间转换为字符串
    let formatted_local = now_local.format("%Y-%m-%d %H:%M:%S %:z").to_string();
    println!("Local Time: {}", formatted_local);
}

use chrono::{NaiveDateTime, Datelike, Timelike, DateTime, Utc, Error};
use chrono::format::{ParseResult, Parser};
fn main() -> Result<(), Error> {
    // 字符串
    let date_str_utc = "2023-10-01 12:34:56";
    let date_str_local = "2023-10-01 12:34:56 +08:00";
    // 定义解析格式
    let parser_utc = "%Y-%m-%d %H:%M:%S";
    let parser_local = "%Y-%m-%d %H:%M:%S %:z";
    // 将字符串解析为UTC DateTime
    let naive_utc: NaiveDateTime = Parser::parse_from_str(date_str_utc, parser_utc)?
        .naive_utc(); // 转换为NaiveUTC
    let dt_utc: DateTime<Utc> = DateTime::from_utc(naive_utc, Utc);
    println!("Parsed UTC Time: {}", dt_utc.format("%Y-%m-%d %H:%M:%S").to_string());
    // 将字符串解析为Local DateTime
    let naive_local: NaiveDateTime = Parser::parse_from_str(date_str_local, parser_local)?
        .naive_local(); // 转换为NaiveLocal
    let dt_local: DateTime<Local> = DateTime::from_naive(naive_local, Local);
    println!("Parsed Local Time: {}", dt_local.format("%Y-%m-%d %H:%M:%S %:z").to_string());
    Ok(())
}