datetime_format.rs

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#[macro_use]

extern crate bencher;

use std::io::Write;

use std::time::{Duration, UNIX_EPOCH};

use bencher::Bencher;

use chrono::{DateTime, Utc};

use humantime::format_rfc3339;

fn rfc3339_humantime_seconds(b: &mut Bencher) {

    let time = UNIX_EPOCH + Duration::new(1_483_228_799, 0);

    let mut buf = Vec::with_capacity(100);

    b.iter(|| {

        buf.truncate(0);

        write!(&mut buf, "{}", format_rfc3339(time)).unwrap()

});

fn rfc3339_chrono(b: &mut Bencher) {

    use chrono::format::Fixed::*;

    use chrono::format::Item;

    use chrono::format::Item::*;

    use chrono::format::Numeric::*;

    use chrono::format::Pad::*;

    let time = DateTime::<Utc>::from_timestamp(1_483_228_799, 0).unwrap();

    let mut buf = Vec::with_capacity(100);

    // formatting code from env_logger

    const ITEMS: &[Item<'static>] = {

&[

            Numeric(Year, Zero),

            Literal("-"),

            Numeric(Month, Zero),

            Literal("-"),

            Numeric(Day, Zero),

            Literal("T"),

            Numeric(Hour, Zero),

            Literal(":"),

            Numeric(Minute, Zero),

            Literal(":"),

            Numeric(Second, Zero),

            Fixed(TimezoneOffsetZ),

};

    b.iter(|| {

        buf.truncate(0);

        write!(

            &mut buf,

            "{}",

            time.format_with_items(ITEMS.iter().cloned())

        .unwrap()

});

benchmark_group!(benches, rfc3339_humantime_seconds, rfc3339_chrono);

benchmark_main!(benches);