date.rs

fn parse_date(string: String) -> Option<DateTime<Utc>> {
    let year = string.get(..4).and_then(|y| y.parse::<i32>().ok());
    let month = string.get(4..6).and_then(|m| m.parse::<u32>().ok());
    let day = string.get(6..8).and_then(|d| d.parse::<u32>().ok());
    let hour = string.get(9..11).and_then(|h| h.parse::<u32>().ok());
    let minute = string.get(12..14).and_then(|mm| mm.parse::<u32>().ok());
    let sec = string.get(15..17).and_then(|s| s.parse::<u32>().ok());
    let ss = string.get(18..21).and_then(|ss| ss.parse::<u32>().ok());

    let r = if year.is_some() && month.is_some() && day.is_some() && hour.is_some()
        && minute.is_some() && sec.is_some() && ss.is_some() {
        Some(Utc.ymd(year.unwrap(), month.unwrap(), day.unwrap()).and_hms_milli(
            hour.unwrap(), minute.unwrap(), sec.unwrap(), ss.unwrap()))
    } else {
        None
    };
}

fn calculate_time_span(start_time: DateTime<Utc>, end_time: DateTime<Utc>) -> i32 {
    (start_time.timestamp_millis() - end_time.timestamp_millis()).abs() as i32
}