Q:

Rust program to print the time in 12-hour format

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 get the current LOCAL date-time and print date-time into 12-hour format using the hour12() function.

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 print time in 12-hour format is given below. The given program is compiled and executed on UBUNTU 18.04 successfully.

// Rust program to print the time 
// in 12 hour format

use chrono::{Datelike, Timelike, Local};

fn main() {
    let current = Local::now();
    
    let (isPm, hour) = current.hour12();
    
    println!("The current UTC time: {:02}:{:02}:{:02} {}",hour,current.minute(),current.second(),
    if isPm { "PM" } else { "AM" });
}

Output:

$datetime> cargo run
   Compiling datetime v0.1.0 (/home/arvind/Desktop/rust/datetime)
    Finished dev [unoptimized + debuginfo] target(s) in 0.29s
     Running `target/debug/datetime`

Local time: 2021-10-30 09:12:53.266391074 -07:00
UTC time: 2021-10-30 16:12:53.266391074 UTC
Current time in RIO(Brazil): 2021-10-30 14:12:53.266391074 -02:00

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 got the current LOCAL date-time using the Local::now() method and converted date-time in 12-hour format using the hour12() function and printed "AM", "PM" using isPm() function.

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