Rust: chrono库，date,time及其它

chrono库日期时间解析

最新推荐文章于 2025-07-23 11:09:31 发布

rustroom

最新推荐文章于 2025-07-23 11:09:31 发布

阅读量3.1k

点赞数 1

CC 4.0 BY-SA版权

分类专栏： Rust 文章标签： rust

本文链接：https://blog.youkuaiyun.com/wowotuo/article/details/64520632

Rust 专栏收录该内容

193 篇文章

订阅专栏

本文介绍了使用Rust语言中的chrono库进行日期时间解析的三种方法：通过FromStr特质及其parse方法解析DateTime，使用DateTime::parse_from_str针对带有偏移量的输入进行解析，以及利用Offset::datetime_from_str在输入中没有显式偏移量时指定默认偏移量。

Parsing can be done with three methods:

The standard FromStr trait (and parse method on a string) can be used for parsing DateTime, DateTime and DateTime values. This parses what the {:?} (std::fmt::Debug) format specifier prints, and requires the offset to be present.

DateTime::parse_from_str parses a date and time with offsets and returns DateTime. This should be used when the offset is a part of input and the caller cannot guess that. It cannot be used when the offset can be missing. DateTime::parse_from_rfc2822 and DateTime::parse_from_rfc3339 are similar but for well-known formats.

Offset::datetime_from_str is similar but returns DateTime of given offset. When the explicit offset is missing from the input, it simply uses given offset. It issues an error when the input contains an explicit offset different from the current offset.

use chrono::prelude::*;

let dt = UTC.ymd(2014, 11, 28).and_hms(12, 0, 9);
let fixed_dt = dt.with_timezone(&FixedOffset::east(9*3600));

// method 1
assert_eq!("2014-11-28T12:00:09Z".parse::<DateTime<UTC>>(), Ok(dt.clone()));
assert_eq!("2014-11-28T21:00:09+09:00".parse::<DateTime<UTC>>(), Ok(dt.clone()));
assert_eq!("2014-11-28T21:00:09+09:00".parse::<DateTime<FixedOffset>>(), Ok(fixed_dt.clone()));

// method 2
assert_eq!(DateTime::parse_from_str("2014-11-28 21:00:09 +09:00", "%Y-%m-%d %H:%M:%S %z"),
           Ok(fixed_dt.clone()));
assert_eq!(DateTime::parse_from_rfc2822("Fri, 28 Nov 2014 21:00:09 +0900"),
           Ok(fixed_dt.clone()));
assert_eq!(DateTime::parse_from_rfc3339("2014-11-28T21:00:09+09:00"), Ok(fixed_dt.clone()));

// method 3
assert_eq!(UTC.datetime_from_str("2014-11-28 12:00:09", "%Y-%m-%d %H:%M:%S"), Ok(dt.clone()));
assert_eq!(UTC.datetime_from_str("Fri Nov 28 12:00:09 2014", "%a %b %e %T %Y"), Ok(dt.clone()));

// oops, the year is missing!
assert!(UTC.datetime_from_str("Fri Nov 28 12:00:09", "%a %b %e %T %Y").is_err());
// oops, the format string does not include the year at all!
assert!(UTC.datetime_from_str("Fri Nov 28 12:00:09", "%a %b %e %T").is_err());
// oops, the weekday is incorrect!
assert!(UTC.datetime_from_str("Sat Nov 28 12:00:09 2014", "%a %b %e %T %Y").is_err());