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乱读天书，不求甚解

Rust 10.03 相关时间模块

2023-02-05 10:10:59 33 0 0

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> use std::time::{Duration, SystemTime};  
use duration_str;  
use chrono::prelude::*;

```rust
use std::time::{Duration, SystemTime};

fn main() {
    let now_time = SystemTime::now();
    println!("{:?}",now_time);//SystemTime { tv_sec: 1644754183, tv_nsec: 872821050 }
    let now_timestamp = now_time.duration_since(SystemTime::UNIX_EPOCH).unwrap();
    println!("{:?}",now_timestamp);
    println!("{:?}",now_timestamp.as_secs()); //只获得秒的部分

let five_seconds_and_six_nanos = Duration::new(5, 6);
    println!("{:?}",five_seconds_and_six_nanos);
}
```

# 将字符串转化为时间    
```
[dependencies]
duration-str = "0.3" 
```
```rust
use duration_str;

fn main() {
    let duration = duration_str::parse("1d").unwrap();
    println!("{:?}",duration.as_secs());
}
```

# chrono 模块  
```
chrono = "0.4"
```
```rust
use chrono::prelude::*;

fn main() {
    let a = 1583971200000_u64;
    let b = NaiveDateTime::from_timestamp((a/1000) as i64,0); 
    //let d = Duration::milliseconds(a as i64);
    let s:String;
    s = b.format("%Y-%m-%d_%H_%M_%S").to_string();
    println!("{:?}",s);
}
```

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