proper time format (RFC3339)

README.md

@@ -38,8 +38,8 @@ $ go run cmd/system-api/*
 $ echo "hello world" > pipe.fifo
 $ curl localhost:8082/api/v1/new_event?message=this+is+a+test
 
-# Query events (timestamp in UTC)
-$ curl -s localhost:8082/api/v1/events | jq -r  '(.[] | [.received_at, .message]) | @tsv'
-2024-09-24T10:45:50.774339Z     hello world
-2024-09-24T10:46:02.01221Z      this is a test
+# Query events (plain text or JSON is supported)
+$ curl -s localhost:8082/api/v1/events?format=text
+2024-10-23T11:59:35Z     hello world
+2024-10-23T11:59:36Z     hello world
 ```

cmd/system-api/server.go

@@ -167,7 +167,7 @@ func (s *Server) handleGetEvents(w http.ResponseWriter, r *http.Request) {
 		// write events as plain text response
 		w.Header().Set("Content-Type", "text/plain")
 		for _, event := range s.events {
-			_, err := w.Write([]byte(event.ReceivedAt.Format("2006-01-02 15:04:05 UTC") + " \t " + event.Message + "\n"))
+			_, err := w.Write([]byte(event.ReceivedAt.Format(time.RFC3339) + " \t " + event.Message + "\n"))
 			if err != nil {
 				s.log.Error("Failed to write event", "err", err)
 				w.WriteHeader(http.StatusInternalServerError)