Q:

Rust program to parse the date and time from a string

belongs to collection: Rust Date and Time Programs

YasminRadwan26
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2022-07-19
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In this program, we will parse date and time from string using the parse_from_str() function and print the result.

Add Chrono date-time external library to your project

  1. Create your project using the below command.
    $cargo new datetime -bin
  2. Goto the project folder cd datetime and edit Cargo.toml file.
    $datetime>nano Cargo.toml
  3. Then add dependency in Cargo.toml file
    [dependencies]
chrono = "0.4"
  4. After that, build your project using the below command
    $datetime>cargo build
  5. Then execute your project after modification in src/main.rs source file.
    $datetime>cargo run
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YasminRadwan26
2022-07-19
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Program/Source Code:

The source code to parse the date and time from the string is given below. The given program is compiled and executed on UBUNTU 18.04 successfully.

// Rust program to parse date and time 
// from the string

use chrono::{DateTime, NaiveDate, NaiveDateTime, NaiveTime};
use chrono::format::ParseError;

fn main() -> Result<(), ParseError> {
	let date_time = NaiveDateTime::parse_from_str("2021-10-29 13:46:24", "%Y-%m-%d %H:%M:%S")?;
    println!("Parsed date and time is: {}", date_time);
   
    Ok(())
}

Output:

$datetime> cargo run
   Compiling datetime v0.1.0 (/home/arvind/Desktop/rust/datetime)
    Finished dev [unoptimized + debuginfo] target(s) in 0.27s
     Running `target/debug/datetime`

Parsed date and time is: 2021-10-29 13:46:24

Explanation:

In the above program, we imported the "Chrono" library to our project for performing date and time operations. We imported the Chrono library using the below line:

use chrono::Utc;

In the main() function, we called NaiveTime::parse_from_str() function to parse the string into date-time and print the result.

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