Convert Postgres timestamp to Rust Chrono

Question

How to covert a PostgreSQL timestamp (with time zone) to Rust Chrono DateTime<Utc>?

Example: 2020-04-12 22:10:57.0+02

Answer 1

You have to use the custom parser from str:

let date_str = "2020-04-12 22:10:57.000+02";
// convert the string into DateTime<FixedOffset>
let datetime = DateTime::parse_from_str(&date_str, "%Y-%m-%d %H:%M:%S%.f%#z").unwrap();
// convert the string into DateTime<Utc> or other timezone
let datetime_utc = datetime.with_timezone(&Utc);

Extra info:

• %.f => .026490: Similar to .%f but left-aligned. These all consume the leading dot.
• %#z => +09: Parsing only: Same as %z but allows minutes to be missing or present.

For more info, see this awnser.

Answer 2

The Postgres type TIMESTAMP is only convertible to chrono's NaiveDateTime.

In order to convert to chrono's DateTime<Utc>, you must use the Postgres type TIMESTAMP WITH TIME ZONE for your column.