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:timing
:sccache 1

Comments¶

There are a few 3rd-party Rust crates time, quanta and chrono for handling time/date. The Rust crate time, is recommended. For detailed discussions, please refer to No Time for Chrono .

In [5]:

use std::time::{SystemTime, UNIX_EPOCH};

In [6]:

SystemTime::now()

Out[6]:

SystemTime { tv_sec: 1638324570, tv_nsec: 811168245 }

In [7]:

let start = SystemTime::now();
start.duration_since(UNIX_EPOCH).expect("Time went backwards")

Out[7]:

1638324597.690945736s

In [8]:

let start = SystemTime::now();
start.duration_since(UNIX_EPOCH).unwrap()

Out[8]:

1638324623.948540298s

In [10]:

let start = SystemTime::now();
start.duration_since(UNIX_EPOCH).unwrap().as_secs()

Out[10]:

1638324793

In [9]:

let start = SystemTime::now();
start.duration_since(UNIX_EPOCH).unwrap().as_millis()

Out[9]:

1638324649987

In [15]:

let start = SystemTime::now();
start.duration_since(UNIX_EPOCH).unwrap().as_nanos()

Out[15]:

1638325403263831531

Format SystemTime (as String)¶

SystemTime itself does not support formatting as string. However, it can be done indirectly by casting SystemTime to chrono::Datetime first.

In [11]:

:dep chrono = "0.4.19"

In [12]:

use std::time::SystemTime;
use chrono::offset::Local;
use chrono::DateTime;

In [13]:

let datetime: DateTime<Local> = SystemTime::now().into();
println!("{}", datetime.format("%Y-%m-%d %H:%M:%S.%f"));

2021-11-30 18:15:06.485079503

In [14]:

Local::now()

Out[14]:

2021-11-30T18:15:12.199268942-08:00

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