How do I convert a SystemTime to ISO 8601 in Rust?

Question

I have a SystemTime variable and I want to get the ISO 8601 format from that date.

Answer 1

The chrono package is the right tool for the job here. SystemTime may or may not be UTC, and chrono takes care of many irritating little details.

use chrono::prelude::{DateTime, Utc};

fn iso8601(st: &std::time::SystemTime) -> String {
    let dt: DateTime<Utc> = st.clone().into();
    format!("{}", dt.format("%+"))
    // formats like "2001-07-08T00:34:60.026490+09:30"
}

To customize the format differently, see the chrono::format::strftime docs.