diff --git a/src/components/ai-edition/LeftPanel.copyMessage.test.tsx b/src/components/ai-edition/LeftPanel.copyMessage.test.tsx
index 3c39fdfae..d9c3d061c 100644
--- a/src/components/ai-edition/LeftPanel.copyMessage.test.tsx
+++ b/src/components/ai-edition/LeftPanel.copyMessage.test.tsx
@@ -249,3 +249,15 @@ describe("ChatStripPanel Copy message (issue #738)", () => {
 		expect(toastError).not.toHaveBeenCalled();
 	});
 });
+
+describe("ChatStripPanel message time (#1134)", () => {
+	it("shows a stored message's time as a clock time, never as the raw ISO string", async () => {
+		stubClipboard(copyToClipboard);
+		const view = await renderPanelWithAssistantMessage();
+
+		// The main process stores every message with an ISO `createdAt`. A session loaded from it,
+		// like the one a first message creates, used to print that string as is.
+		expect(view.container.textContent).not.toContain("2026-09-23T00:00:01");
+		expect(view.getByText(new Date("2026-09-23T00:00:01Z").toLocaleTimeString())).toBeTruthy();
+	});
+});
diff --git a/src/components/ai-edition/LeftPanel.tsx b/src/components/ai-edition/LeftPanel.tsx
index 3a490a772..84c5227b7 100644
--- a/src/components/ai-edition/LeftPanel.tsx
+++ b/src/components/ai-edition/LeftPanel.tsx
@@ -34,6 +34,7 @@ interface ChatDisplayMessage {
 	id?: string;
 	role: string;
 	content: string;
+	/** ISO timestamp, as the main process stores it; formatted only where it is drawn (#1134). */
 	time?: string;
 	toolCalls?: AiEditionToolCallSummary[];
 	// ponytail: axcut parity — non-null on user messages that have a
@@ -46,6 +47,12 @@ interface ChatDisplayMessage {
 	thinking?: string;
 }
 
+/** A message's clock time; a stored value that is no date is shown as stored. */
+function formatMessageTime(time: string): string {
+	const date = new Date(time);
+	return Number.isNaN(date.getTime()) ? time : date.toLocaleTimeString();
+}
+
 // Quick-access model picker anchored to the composer's model pill — mirrors
 // axcut's LlmPopover in "models"/"providers" mode (a lightweight popover, not
 // the full AI-settings modal). "Provider settings…" in the providers screen
@@ -601,7 +608,7 @@ export function ChatStripPanel() {
 				id: optimisticUserId,
 				role: "user",
 				content: text,
-				time: new Date().toLocaleTimeString(),
+				time: new Date().toISOString(),
 				checkpointId: optimisticUserId,
 			},
 		]);
@@ -672,7 +679,7 @@ export function ChatStripPanel() {
 					{
 						role: "assistant",
 						content: assistant.content,
-						time: new Date().toLocaleTimeString(),
+						time: new Date().toISOString(),
 						toolCalls: assistant.toolCalls,
 						// ponytail: snapshot the live reasoning trace onto the
 						// finished message so it can be revisited (collapsed by
@@ -1263,7 +1270,7 @@ export function ChatStripPanel() {
 												color: "var(--muted)",
 											}}
 										>
-											{m.time}
+											{formatMessageTime(m.time)}
 										</span>
 									) : null}
 								</div>