add custom date

serde-json-test/Cargo.toml

@@ -9,3 +9,4 @@ edition = "2018"
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
+chrono = "0.4.10"

serde-json-test/src/main.rs

@@ -3,6 +3,24 @@ extern crate serde_json;
 
 use serde::{Deserialize, Serialize};
 use serde_json::{Result, Value};
+use chrono::{DateTime, Utc, TimeZone};
+
+mod my_date_format {
+    use chrono::{DateTime, Utc, TimeZone};
+    use serde::{self, Deserialize, Serializer, Deserializer};
+
+    const FORMAT: &'static str = "%Y-%m-%d %H:%M:%S";
+
+    pub fn serialize<S>(date: &DateTime<Utc>, serializer: S ) -> Result<S::Ok, S::Error> where S: Serializer {
+        let s = format!("{}", date.format(FORMAT));
+        serializer.serialize_str(&s)
+    }
+
+    pub fn deserialize<'de, D>(deserializer: D ) -> Result<DateTime<Utc>, D::Error> where D: Deserializer<'de> {
+        let s = String::deserialize(deserializer)?;
+        Utc.datetime_from_str(&s, FORMAT).map_err(serde::de::Error::custom)
+    }
+}
 
 // https://serde.rs/container-attrs.html
 #[derive(Clone, Copy, Debug, Serialize, Deserialize)]
@@ -18,11 +36,14 @@ enum TestEnum {
 #[derive(Clone, Debug, Serialize, Deserialize)]
 struct TestStruct {
     ty: TestEnum,
+    #[serde(with = "my_date_format")]
+    timestamp: DateTime<Utc>,
 }
 
 fn main() -> Result<()> {
     let serialized = serde_json::to_string(&TestStruct{
         ty: TestEnum::TypeA,
+        timestamp: Utc.datetime_from_str("2020-01-28 17:04:00", "%Y-%m-%d %H:%M:%S").map_err(serde::de::Error::custom)?,
     })?;
 
     println!("{}", serialized);