How do I go from a NaiveDate to a specific TimeZone with Chrono?

Question

I am parsing dates and times in Rust using the chrono crate. The dates and times are from a website in which the date and time are from different sections of the page.

Answer 1

The Chrono documentation could probably be improved to make it easier to find how to do these things.

Assuming this is your starting point:

use chrono::{DateTime, FixedOffset, NaiveDate, NaiveDateTime, NaiveTime, TimeZone, Utc};

// The date you parsed
let date = NaiveDate::from_ymd(2018, 5, 13);
// The known 1 hour time offset in seconds
let tz_offset = FixedOffset::east(1 * 3600);
// The known time
let time = NaiveTime::from_hms(17, 0, 0);
// Naive date time, with no time zone information
let datetime = NaiveDateTime::new(date, time);

You can then use the FixedOffset to construct a DateTime:

let dt_with_tz: DateTime = tz_offset.from_local_datetime(&datetime).unwrap();

If you need to convert it to a DateTime, you can do this:

let dt_with_tz_utc: DateTime = Utc.from_utc_datetime(&dt_with_tz.naive_utc());