crontime 0.2.0

cron expression -> time iterator
Documentation 
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use time::macros::datetime;

#[test]
fn test() {
    let now = datetime!(1917-11-07 00:00:00 UTC);

    let ios: &[(&str, &[(usize, time::OffsetDateTime)])] = &[
        (
            "* * * * *",
            &[
                (0, datetime!(1917-11-07 00:00:00 UTC)),
                (1, datetime!(1917-11-07 00:01:00 UTC)),
            ],
        ),
        (
            "0 * * * *",
            &[
                (0, datetime!(1917-11-07 00:00:00 UTC)),
                (1, datetime!(1917-11-07 01:00:00 UTC)),
            ],
        ),
        (
            "7 * * * *",
            &[
                (0, datetime!(1917-11-07 00:07:00 UTC)),
                (1, datetime!(1917-11-07 01:07:00 UTC)),
            ],
        ),
        (
            "2-4 * * * *",
            &[
                (0, datetime!(1917-11-07 00:02:00 UTC)),
                (1, datetime!(1917-11-07 00:03:00 UTC)),
                (2, datetime!(1917-11-07 00:04:00 UTC)),
                (3, datetime!(1917-11-07 01:02:00 UTC)),
            ],
        ),
        (
            "2,4 * * * *",
            &[
                (0, datetime!(1917-11-07 00:02:00 UTC)),
                (1, datetime!(1917-11-07 00:04:00 UTC)),
                (2, datetime!(1917-11-07 01:02:00 UTC)),
            ],
        ),
        (
            "* 0 * * *",
            &[
                (0, datetime!(1917-11-07 00:00:00 UTC)),
                (1, datetime!(1917-11-07 00:01:00 UTC)),
                (60, datetime!(1917-11-08 00:00:00 UTC)),
                (121, datetime!(1917-11-09 00:01:00 UTC)),
            ],
        ),
        (
            "3 6-8 * * *",
            &[
                (0, datetime!(1917-11-07 06:03:00 UTC)),
                (1, datetime!(1917-11-07 07:03:00 UTC)),
                (2, datetime!(1917-11-07 08:03:00 UTC)),
                (3, datetime!(1917-11-08 06:03:00 UTC)),
                (6, datetime!(1917-11-09 06:03:00 UTC)),
                (10, datetime!(1917-11-10 07:03:00 UTC)),
                (14, datetime!(1917-11-11 08:03:00 UTC)),
            ],
        ),
        (
            "3 2,8 * * *",
            &[
                (0, datetime!(1917-11-07 02:03:00 UTC)),
                (1, datetime!(1917-11-07 08:03:00 UTC)),
                (2, datetime!(1917-11-08 02:03:00 UTC)),
                (4, datetime!(1917-11-09 02:03:00 UTC)),
                (7, datetime!(1917-11-10 08:03:00 UTC)),
            ],
        ),
    ];

    for (i, os) in ios {
        let mut ct = crontime::build(now, i).expect("build").enumerate();

        for (n, o) in *os {
            let oo = ct
                .find_map(|(nn, oo)| (nn == *n).then_some(oo))
                .expect("find");

            println!("{i} | {n} | {o}");
            assert_eq!(oo, *o);
        }

        println!();
    }
}