Rust 中的时间处理利器chrono示例详解

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

use chrono::{Local, Utc};
fn main() {
    // 获取本地时间
    let local_time = Local::now();
    println!("Local time: {}", local_time);
    // 获取 UTC 时间
    let utc_time = Utc::now();
    println!("UTC time: {}", utc_time);
}

use chrono::{Local, Duration};
fn main() {
    // 获取当前时间
    let now = Local::now();
    println!("Current time: {}", now);
    // 计算5分钟前的时间
    let five_minutes_ago = now - Duration::minutes(5);
    println!("Five minutes ago: {}", five_minutes_ago);
    // 计算1小时后的时间
    let one_hour_later = now + Duration::hours(1);
    println!("One hour later: {}", one_hour_later);
    // 计算两个时间之间的差值
    let duration = one_hour_later - five_minutes_ago;
    println!("Duration between one hour later and five minutes ago: {:?}", duration);
}

use chrono::{NaiveDate, NaiveTime, NaiveDateTime};
fn main() {
    // 创建一个日期对象
    let date = NaiveDate::from_ymd(2025, 6, 26);
    println!("Date: {}", date);
    // 创建一个时间对象
    let time = NaiveTime::from_hms(15, 30, 0);
    println!("Time: {}", time);
    // 创建一个日期时间对象
    let datetime = NaiveDateTime::new(date, time);
    println!("DateTime: {}", datetime);
    // 格式化日期时间
    let formatted = datetime.format("%Y-%m-%d %H:%M:%S").to_string();
    println!("Formatted DateTime: {}", formatted);
    // 解析日期时间
    let parsed: NaiveDateTime = NaiveDateTime::parse_from_str("2025-06-26 15:30:00", "%Y-%m-%d %H:%M:%S").unwrap();
    println!("Parsed DateTime: {}", parsed);
}

use chrono::{Local, Utc, FixedOffset, TimeZone};
fn main() {
    // 获取本地时间
    let local_time = Local::now();
    println!("Local time: {}", local_time);
    // 获取 UTC 时间
    let utc_time = Utc::now();
    println!("UTC time: {}", utc_time);
    // 转换为特定时区的时间
    let offset = FixedOffset::east(8 * 3600); // 东八区
    let beijing_time = utc_time.with_timezone(&offset);
    println!("Beijing time: {}", beijing_time);
}

use chrono::{NaiveDate, Datelike};
fn main() {
    let start_date = NaiveDate::from_ymd(2025, 6, 1);
    let end_date = NaiveDate::from_ymd(2025, 6, 26);
    let days_between = (end_date - start_date).num_days();
    println!("Days between: {}", days_between);
}

use chrono::NaiveDate;
fn main() {
    let year = 2024;
    let is_leap_year = NaiveDate::from_ymd(year, 2, 29).is_valid();
    println!("Is {} a leap year? {}", year, is_leap_year);
}

use chrono::{Local, Datelike};
fn main() {
    let today = Local::today();
    let start_of_week = today - chrono::Duration::days(today.weekday().num_days_from_sunday() as u64);
    println!("Start of week: {}", start_of_week);
}