How to Add and Subtract Time in Rust

Use the + and - operators on numeric types like i32 or f64 to add and subtract values directly. Rust does not have a built-in Time type for arithmetic in the standard library, so you typically perform math on durations (like milliseconds) or use a crate like chrono for calendar dates.

fn main() {
    let start = 10.5; // e.g., seconds or milliseconds
    let duration = 2.3;
    let end = start + duration;
    let previous = start - duration;
    println!("End: {end}, Previous: {previous}");
}

You add and subtract time in Rust by treating time as a number, such as milliseconds since the start of the program. Think of it like adding or subtracting money; you just use the standard plus and minus signs on the numbers representing the time. For complex calendar dates, you need an external tool, but for simple durations, basic math works perfectly.