diff --git a/java/com/google/gerrit/acceptance/testsuite/change/PerPatchsetOperationsImpl.java b/java/com/google/gerrit/acceptance/testsuite/change/PerPatchsetOperationsImpl.java
index 9f2e1f4..89cfa16 100644
--- a/java/com/google/gerrit/acceptance/testsuite/change/PerPatchsetOperationsImpl.java
+++ b/java/com/google/gerrit/acceptance/testsuite/change/PerPatchsetOperationsImpl.java
@@ -186,11 +186,13 @@
       short side = commentCreation.side().orElse(CommentSide.PATCHSET_COMMIT).getNumericSide();
       Boolean unresolved = commentCreation.unresolved().orElse(null);
       String parentUuid = commentCreation.parentUuid().orElse(null);
+      Timestamp createdOn =
+          commentCreation.createdOn().map(Timestamp::from).orElse(context.getWhen());
       HumanComment newComment =
           commentsUtil.newHumanComment(
               context.getNotes(),
               context.getUser(),
-              context.getWhen(),
+              createdOn,
               filePath,
               patchsetId,
               side,
diff --git a/java/com/google/gerrit/acceptance/testsuite/change/TestCommentCreation.java b/java/com/google/gerrit/acceptance/testsuite/change/TestCommentCreation.java
index 2f4ddd0..2031bde 100644
--- a/java/com/google/gerrit/acceptance/testsuite/change/TestCommentCreation.java
+++ b/java/com/google/gerrit/acceptance/testsuite/change/TestCommentCreation.java
@@ -21,6 +21,9 @@
 import com.google.gerrit.entities.Account;
 import com.google.gerrit.entities.Comment;
 import com.google.gerrit.entities.Patch;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
 import java.util.Optional;
 
 /**
@@ -49,6 +52,8 @@
 
   public abstract Optional<Account.Id> author();
 
+  public abstract Optional<Instant> createdOn();
+
   abstract Comment.Status status();
 
   abstract ThrowingFunction<TestCommentCreation, String> commentCreator();
@@ -175,6 +180,22 @@
     public abstract Builder author(Account.Id accountId);
 
     /**
+     * Creation time of the comment. Like {@link #createdOn(Instant)} but with an arbitrary, fixed
+     * time zone (-> deterministic test execution).
+     */
+    public Builder createdOn(LocalDateTime createdOn) {
+      // We don't care about the exact time zone in most tests, just that it's fixed so that tests
+      // are deterministic.
+      return createdOn(createdOn.atZone(ZoneOffset.UTC).toInstant());
+    }
+
+    /**
+     * Creation time of the comment. This may also lie in the past or future. Comments stored in
+     * NoteDb support only second precision.
+     */
+    public abstract Builder createdOn(Instant createdOn);
+
+    /**
      * Status of the comment. Hidden in the API surface. Use {@link
      * PerPatchsetOperations#newComment()} or {@link PerPatchsetOperations#newDraftComment()}
      * depending on which type of comment you want to create.
diff --git a/javatests/com/google/gerrit/acceptance/testsuite/change/PatchsetOperationsImplTest.java b/javatests/com/google/gerrit/acceptance/testsuite/change/PatchsetOperationsImplTest.java
index fa28396..c29cf99 100644
--- a/javatests/com/google/gerrit/acceptance/testsuite/change/PatchsetOperationsImplTest.java
+++ b/javatests/com/google/gerrit/acceptance/testsuite/change/PatchsetOperationsImplTest.java
@@ -14,6 +14,7 @@
 
 package com.google.gerrit.acceptance.testsuite.change;
 
+import static com.google.common.truth.Truth.assertThat;
 import static com.google.gerrit.extensions.common.testing.CommentInfoSubject.assertThat;
 import static com.google.gerrit.extensions.common.testing.CommentInfoSubject.assertThatList;
 import static com.google.gerrit.extensions.common.testing.RobotCommentInfoSubject.assertThat;
@@ -33,6 +34,12 @@
 import com.google.gerrit.extensions.restapi.RestApiException;
 import com.google.gerrit.truth.NullAwareCorrespondence;
 import com.google.inject.Inject;
+import java.sql.Timestamp;
+import java.time.Duration;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.Month;
+import java.time.ZoneOffset;
 import java.util.List;
 import org.junit.Test;
 
@@ -315,6 +322,59 @@
   }
 
   @Test
+  public void commentIsCreatedWithSpecifiedCreationTime() throws Exception {
+    Change.Id changeId = changeOperations.newChange().create();
+
+    // Don't use nanos. NoteDb supports only second precision.
+    Instant creationTime =
+        LocalDateTime.of(2020, Month.SEPTEMBER, 15, 12, 10, 43).atZone(ZoneOffset.UTC).toInstant();
+    String commentUuid =
+        changeOperations
+            .change(changeId)
+            .currentPatchset()
+            .newComment()
+            .createdOn(creationTime)
+            .create();
+
+    Timestamp creationTimestamp = Timestamp.from(creationTime);
+    CommentInfo comment = getCommentFromServer(changeId, commentUuid);
+    assertThat(comment).updated().isEqualTo(creationTimestamp);
+  }
+
+  @Test
+  public void zoneOfCreationDateCanBeOmitted() throws Exception {
+    Change.Id changeId = changeOperations.newChange().create();
+
+    // As we don't care about the exact time zone internally used as a default, do a relative test
+    // so that we don't need to assert on exact instants in time. For a relative test, we need two
+    // comments whose creation date should be exactly the specified amount apart.
+    // Don't use nanos or millis. NoteDb supports only second precision.
+    LocalDateTime creationTime1 = LocalDateTime.of(2020, Month.SEPTEMBER, 15, 12, 10, 43);
+    LocalDateTime creationTime2 = creationTime1.plusMinutes(10);
+    String commentUuid1 =
+        changeOperations
+            .change(changeId)
+            .currentPatchset()
+            .newComment()
+            .createdOn(creationTime1)
+            .create();
+    String commentUuid2 =
+        changeOperations
+            .change(changeId)
+            .currentPatchset()
+            .newComment()
+            .createdOn(creationTime2)
+            .create();
+
+    CommentInfo comment1 = getCommentFromServer(changeId, commentUuid1);
+    Instant comment1Creation = comment1.updated.toInstant();
+    CommentInfo comment2 = getCommentFromServer(changeId, commentUuid2);
+    Instant comment2Creation = comment2.updated.toInstant();
+    Duration commentCreationDifference = Duration.between(comment1Creation, comment2Creation);
+    assertThat(commentCreationDifference).isEqualTo(Duration.ofMinutes(10));
+  }
+
+  @Test
   public void draftCommentCanBeCreatedWithoutSpecifyingAnyParameters() throws Exception {
     Change.Id changeId = changeOperations.newChange().create();
 
@@ -626,6 +686,59 @@
   }
 
   @Test
+  public void draftCommentIsCreatedWithSpecifiedCreationTime() throws Exception {
+    Change.Id changeId = changeOperations.newChange().create();
+
+    // Don't use nanos. NoteDb supports only second precision.
+    Instant creationTime =
+        LocalDateTime.of(2020, Month.SEPTEMBER, 15, 12, 10, 43).atZone(ZoneOffset.UTC).toInstant();
+    String commentUuid =
+        changeOperations
+            .change(changeId)
+            .currentPatchset()
+            .newDraftComment()
+            .createdOn(creationTime)
+            .create();
+
+    Timestamp creationTimestamp = Timestamp.from(creationTime);
+    CommentInfo comment = getDraftCommentFromServer(changeId, commentUuid);
+    assertThat(comment).updated().isEqualTo(creationTimestamp);
+  }
+
+  @Test
+  public void zoneOfCreationDateOfDraftCommentCanBeOmitted() throws Exception {
+    Change.Id changeId = changeOperations.newChange().create();
+
+    // As we don't care about the exact time zone internally used as a default, do a relative test
+    // so that we don't need to assert on exact instants in time. For a relative test, we need two
+    // comments whose creation date should be exactly the specified amount apart.
+    // Don't use nanos or millis. NoteDb supports only second precision.
+    LocalDateTime creationTime1 = LocalDateTime.of(2020, Month.SEPTEMBER, 15, 12, 10, 43);
+    LocalDateTime creationTime2 = creationTime1.plusMinutes(10);
+    String commentUuid1 =
+        changeOperations
+            .change(changeId)
+            .currentPatchset()
+            .newDraftComment()
+            .createdOn(creationTime1)
+            .create();
+    String commentUuid2 =
+        changeOperations
+            .change(changeId)
+            .currentPatchset()
+            .newDraftComment()
+            .createdOn(creationTime2)
+            .create();
+
+    CommentInfo comment1 = getDraftCommentFromServer(changeId, commentUuid1);
+    Instant comment1Creation = comment1.updated.toInstant();
+    CommentInfo comment2 = getDraftCommentFromServer(changeId, commentUuid2);
+    Instant comment2Creation = comment2.updated.toInstant();
+    Duration commentCreationDifference = Duration.between(comment1Creation, comment2Creation);
+    assertThat(commentCreationDifference).isEqualTo(Duration.ofMinutes(10));
+  }
+
+  @Test
   public void noDraftCommentsAreCreatedOnCreationOfPublishedComment() throws Exception {
     Change.Id changeId = changeOperations.newChange().create();