Get println! to prefix given string with current time

Question

println!("Start") // Start
printlnt!("Start"); // [231209_14:00:00] Start

How could I make a macro like the above?

Answer 1

You can define a macro as below

macro_rules! printlnt {
    ($($arg:tt)*) => {
        println!("[{}] {}", chrono::Local::now().format("%y%m%d_%H:%M:%S"), $($arg)*);
    };
}