Access the process starting time everywhere

If you need to access the process starting time from several functions, then instead of passing it around or instead of using the caching we could use the std::sync::LazyLock.

examples/fixed-start-time/src/main.rs

use std::sync::LazyLock;
use std::time::SystemTime;

static START_TIME: LazyLock<SystemTime> = LazyLock::new(SystemTime::now);

fn main() {
    print_start_time();
    print_start_time();

}

fn print_start_time() {
    println!("{:?}", *START_TIME);
}

Output

examples/fixed-start-time/out.txt

SystemTime { tv_sec: 1781242831, tv_nsec: 637877888 }
SystemTime { tv_sec: 1781242831, tv_nsec: 637877888 }