chrono stftime parsing "%::z" with seconds (+00:00:00)

[Fuerst2718]

Trying to parse a string with TZ-Information including seconds (+00:00:00) fails (see below 3rd element in the vector).

use chrono::DateTime; // chrono 0.4.38

fn main() {
    // from ...
    // https://docs.rs/chrono/latest/chrono/format/strftime/index.html
    // ... under "TIME ZONE SPECIFIERS:"
    // %::z	| +09:30:00 | Offset from the local time to UTC with seconds.

    let f = "%Y-%m-%dT%H:%M:%S%::z";

    // Testvalues
    let tooshort_ok_toolong = [
        "2023-01-02T23:24:25+01",       // really to short -> fails
        "2023-01-02T23:24:25+01:00",    // although to short but is Ok ?
        "2023-01-02T23:24:25+01:30:01", // _should_ run but fails
    ];

    for s in tooshort_ok_toolong.iter() {
        let t = DateTime::parse_from_str(s, f);
        println!("Parse {:<28} > {} > {:?}", s, f, t);
    }

    let dt = chrono::offset::Utc::now();
    println!("\nFormatting \"{}\" ok > {} > {}",dt, f, dt.format(f));

}

Running the program gives ...

Parse 2023-01-02T23:24:25+01       > %Y-%m-%dT%H:%M:%S%::z > Err(ParseError(TooShort))
Parse 2023-01-02T23:24:25+01:00    > %Y-%m-%dT%H:%M:%S%::z > Ok(2023-01-02T23:24:25+01:00)
Parse 2023-01-02T23:24:25+01:30:01 > %Y-%m-%dT%H:%M:%S%::z > Err(ParseError(TooLong))

Formatting "2024-11-16 18:36:11.833133 UTC" ok > %Y-%m-%dT%H:%M:%S%::z > 2024-11-16T18:36:11+00:00:00

Formatting "2024-11-16 18:20:44.712920200 UTC" ok %Y-%m-%dT%H:%M:%S%::z > 2024-11-16T18:20:44+00:00:00