使用serde从字符串毫秒时间戳反序列化DateTime

[dependencies]
serde = "1.0"
serde_json = "1.0"

use serde::{Deserialize, de};
use serde_json::Value;
use chrono::{DateTime, Utc};

struct DateTimeDeserializer;

impl<'de> de::Visitor<'de> for DateTimeDeserializer {
    type Value = DateTime<Utc>;

    fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
        formatter.write_str("a string representing a millisecond timestamp")
    }

    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
    where
        E: de::Error,
    {
        let timestamp: i64 = value.parse().map_err(de::Error::custom)?;
        let datetime = DateTime::<Utc>::from_utc(
            chrono::NaiveDateTime::from_timestamp(timestamp / 1000, (timestamp % 1000) as u32 * 1_000_000),
            Utc,
        );
        Ok(datetime)
    }
}

fn main() {
    let json = r#"{"timestamp": "1634567890123"}"#;
    let data: Value = serde_json::from_str(json).unwrap();

    let timestamp: DateTime<Utc> = data["timestamp"].to_string().parse().unwrap();
    println!("Deserialized timestamp: {}", timestamp);
}