Rust time::OffsetDateTime數字轉成時間

1月 06, 2024 LaGee

time::OffsetDateTime數字轉成時間

time::OffsetDateTime[1]主要作用就是顯示日期

他可以將數字轉換成日期

也可以將日期轉換為數字

最多可有奈米精度

數字指的是Unix Time[2]

以1970年1月1日0:00:00為起始

常用的方法

UNIX_EPOCH[3]

    pub const UNIX_EPOCH: Self = _

UNIX_EPOCH就是最初始值，也就是1970年1月1號0點

use time::OffsetDateTime;

fn main() {

    println!("{:?}", OffsetDateTime::UNIX_EPOCH);

}

1970-01-01 0:00:00.0 +00:00:00

now_utc[4]

   pub fn now_utc() -> Self

now_utc就是直接輸出現在的時間

如果要改成台灣時間記得UTC+8

use time::OffsetDateTime;

fn main() {

    println!("{:?}", OffsetDateTime::now_utc());

}

2024-01-06 5:18:38.2221338 +00:00:00

from_unix_timestamp[5]

    pub const fn from_unix_timestamp(timestamp: i64) -> Result<Self, ComponentRange>

from_unix_timestamp可以將unix_timestamp轉換為日期

最後輸出是Result要unwrap

例如

use time::OffsetDateTime;

fn main() {

    let time = OffsetDateTime::from_unix_timestamp(1758634950);

    println!("{:?}", time.unwrap());

}

2025-09-23 13:42:30.0 +00:00:00

也可以使用from_unix_timestamp_nanos[6]達到奈秒精度

unix_timestamp[7]

    pub const fn unix_timestamp(self) -> i64

而unix_timestamp則是反過來

可以將日期轉換為unix timestamp

use time::OffsetDateTime;

fn main() {

    let time = OffsetDateTime::now_utc();

    let timestamp = time.unix_timestamp();

    println!("{}", timestamp);

}

1704519287

也有unix_timestamp_nanos[8]取得奈米精度

second[9]

    pub const fn second(self) -> u8

second可以獲得time的時間

例如

use time::OffsetDateTime;

fn main() {

    let time = OffsetDateTime::now_utc();

    let time_sec = time.second();

    println!("{}", time);

    println!("{}", time_sec);

}

2024-01-06 5:46:18.4763776 +00:00:00 18

同時也有year、month、day、hour、minute、millisecond、microsecond、nanosecond

use time::OffsetDateTime;

fn main() {
    let time = OffsetDateTime::now_utc();
    let time_year = time.year();
    let time_month = time.month();
    let time_day = time.day();
    let time_hour = time.hour();
    let time_minute = time.minute();
    let time_sec = time.second();
    let time_millisec = time.millisecond();
    let time_microsec = time.microsecond();
    let time_nanosec = time.nanosecond();
    println!("{}", time);
    println!("{}", time_year);
    println!("{}", time_month);
    println!("{}", time_day);
    println!("{}", time_hour);
    println!("{}", time_minute);
    println!("{}", time_sec);
    println!("{}", time_millisec);
    println!("{}", time_microsec);
    println!("{}", time_nanosec);
}
2024-01-06 5:48:54.7823054 +00:00:00
2024   
January
6      
5      
48     
54     
782    
782305 
782305400

加減法

OffsetDateTime也可以加減

舉個例子

use time::{OffsetDateTime, Duration};

fn main() {
    let timestamp_start = OffsetDateTime::from_unix_timestamp(1704520785).unwrap();
    let timestamp_end = OffsetDateTime::from_unix_timestamp(1704520845).unwrap();
    let duration: Duration = timestamp_end - timestamp_start;
    println!("{}", duration);
}
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