Copilot commented on code in PR #13677:
URL: https://github.com/apache/skywalking/pull/13677#discussion_r2707341866


##########
oap-server/server-query-plugin/promql-plugin/src/test/java/org/apache/skywalking/promql/handler/PromQLApiHandlerTest.java:
##########
@@ -0,0 +1,55 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package org.apache.skywalking.promql.handler;
+
+import java.time.OffsetDateTime;
+import org.apache.skywalking.oap.query.promql.handler.PromQLApiHandler;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class PromQLApiHandlerTest {
+
+    @Test
+    public void testRFC3399Parse() {

Review Comment:
   The test method name contains a typo. It should be "testRFC3339Parse" 
instead of "testRFC3399Parse" to correctly reference the RFC 3339 standard.
   ```suggestion
       public void testRFC3339Parse() {
   ```



##########
oap-server/server-query-plugin/promql-plugin/src/main/java/org/apache/skywalking/oap/query/promql/handler/PromQLApiHandler.java:
##########
@@ -597,7 +613,8 @@ private static long formatTimestamp2Millis(String 
timestamp) {
             time = Double.valueOf(timestamp).longValue() * 1000;
         } catch (NumberFormatException e) {
             // if RFC3399 format, such as 2024-09-19T20:11:00.781Z
-            time = ISODateTimeFormat.dateTime().parseMillis(timestamp);
+            OffsetDateTime odt = OffsetDateTime.parse(timestamp, 
RFC3339_FORMATTER);
+            time = odt.toEpochSecond() * 1000;

Review Comment:
   The conversion from OffsetDateTime to milliseconds only uses seconds 
precision (toEpochSecond() * 1000), which discards any millisecond information 
present in the timestamp. For timestamps like "2026-01-20T03:27:18.123Z", the 
.123 milliseconds will be lost. Consider using odt.toInstant().toEpochMilli() 
instead to preserve millisecond precision.
   ```suggestion
               time = odt.toInstant().toEpochMilli();
   ```



##########
oap-server/server-query-plugin/promql-plugin/src/main/java/org/apache/skywalking/oap/query/promql/handler/PromQLApiHandler.java:
##########
@@ -597,7 +613,8 @@ private static long formatTimestamp2Millis(String 
timestamp) {
             time = Double.valueOf(timestamp).longValue() * 1000;
         } catch (NumberFormatException e) {
             // if RFC3399 format, such as 2024-09-19T20:11:00.781Z

Review Comment:
   The comment references "RFC3399" but the correct standard name is "RFC3339". 
This should be corrected for accuracy.
   ```suggestion
               // if RFC3339 format, such as 2024-09-19T20:11:00.781Z
   ```



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