How to find the difference between 2 NaiveDateTime

问题:

I am using chrono. I have now() and some other NaiveDateTime. How can I find a difference between them?

let now = Utc::now().naive_utc();
let dt1 = get_my_naive_datetime();

回答1:

Use NaiveDateTime::signed_duration_since:

println!("{:?}", dt1.signed_duration_since(now))

(playground)

It returns a Duration, which has &self-taking methods to yield whatever units you like, e.g. dt1.signed_duration_since(now).num_days().