How to Serialize and Deserialize Dates with Serde in Rust

Use the chrono crate with serde to handle date serialization and deserialization by deriving traits and annotating fields with format strings.

use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};

#[derive(Debug, Serialize, Deserialize)]
struct Event {
    #[serde(with = "chrono::serde::ts_utc")]
    timestamp: DateTime<Utc>,
}

This configuration serializes dates as Unix timestamps (integers) in UTC. For human-readable ISO 8601 strings, replace ts_utc with serde_with::rust::chrono::serde::ts_utc or use #[serde(with = "chrono::serde::iso8601")] if using the chrono feature set.

Serde converts Rust data structures into formats like JSON, but it doesn't know how to handle dates by default because dates are complex objects. You need to tell Serde exactly how to turn your date into text or numbers so it can be saved or sent over the network. Think of it like giving a translator a specific dictionary for a language they don't speak yet.