Fix parsing of timestamps with newer lava

In the latest version of lava the dt field is created with
atetime.datetime.now(datetime.UTC).isoformat() rather then
datetime.datetime.utcnow().isoformat(). This causes the timezone
specifier to be added (always +00:00 as the logs are UTC)'.

From a Rust perspective the former is a `NaiveDateTime` (no timezone)
while the later is a `DateTime<Utc>`. Adjust the parsing to try both,
but convert to NaiveDateTime to keep the same user API. In future
potentially this could be moved to always be a DateTime to make it more
clear to the end-user what the stamp is

Author: sjoerdsimons

lava-api/src/joblog.rs

@@ -5,7 +5,7 @@ use std::task::Poll;
 use std::time::Duration;
 
 use bytes::{Bytes, BytesMut};
-use chrono::NaiveDateTime;
+use chrono::{DateTime, NaiveDateTime, Utc};
 use futures::future::BoxFuture;
 use futures::stream::BoxStream;
 use futures::{prelude::*, ready};
@@ -218,8 +218,25 @@ pub enum JobLogLevel {
     Exception,
 }
 
+fn job_deserialize_dt<'de, D>(d: D) -> Result<NaiveDateTime, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    #[derive(Deserialize)]
+    #[serde(untagged)]
+    enum DorN {
+        D(DateTime<Utc>),
+        N(NaiveDateTime),
+    }
+    match DorN::deserialize(d)? {
+        DorN::D(d) => Ok(d.naive_utc()),
+        DorN::N(n) => Ok(n),
+    }
+}
+
 #[derive(Debug, Clone, Deserialize)]
 pub struct JobLogEntry {
+    #[serde(deserialize_with = "job_deserialize_dt")]
     pub dt: NaiveDateTime,
     pub lvl: JobLogLevel,
     pub ns: Option<String>,
@@ -302,3 +319,21 @@ impl Stream for JobLog<'_> {
         }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn job_log_entry_deserialisation() {
+        let entry0: JobLogEntry = serde_json::from_str(
+            r#"{"dt": "2026-06-02T12:16:27.730458", "lvl": "results", "msg": {"definition": "lava", "case": "job", "result": "pass"}}"#,
+        )
+        .unwrap();
+        let entry1: JobLogEntry = serde_json::from_str(
+            r#"{"dt": "2026-06-02T12:16:27.730458+00:00", "lvl": "results", "msg": {"definition": "lava", "case": "job", "result": "pass"}}"#,
+        )
+        .unwrap();
+        assert_eq!(entry0.dt, entry1.dt);
+    }
+}