extern crate chrono; // 0.4.3
use chrono::prelude::*;

fn main() {
    // AM -> works ok
    let works = Utc.datetime_from_str("01/01/2000 04:00:00 AM", "%m/%d/%Y %H:%M:%S %p").unwrap();
    println!("{:?}", works);
    // PM, hour > 12 -> works (???)
    let works = Utc.datetime_from_str("01/01/2000 14:00:00 PM", "%m/%d/%Y %H:%M:%S %p").unwrap();
    println!("{:?}", works);
    // PM hour <= 12 -> fails
    let fails = Utc.datetime_from_str("01/01/2000 04:00:00 PM", "%m/%d/%Y %H:%M:%S %p").unwrap();
    println!("{:?}", fails);
}