Loss of information when converting LDT to LTOD

[mhasel]

In the following function, timestamp_subsec_millis should be timestamp_subsec_nanos and consequently .and_hms_milli needs to be and_hms_nano. Otherwise the trailing 6 digits are always going to be 0, regardless of the input.

pub extern "C" fn DATE_AND_TIME_TO_TIME_OF_DAY(input: i64) -> i64 {
    let date_time = chrono::Utc.timestamp_nanos(input);

    // --snip
    let milli = date_time.timestamp_subsec_millis();

    let new_date_time =
        chrono::NaiveDate::from_ymd(1970, 1, 1).and_hms_milli(hour, min, sec, milli);

    new_date_time.timestamp_nanos()
}