diff --git a/src/commands/flows.test.ts b/src/commands/flows.test.ts
index 3fc05a9a2b80..426f8e1c34a2 100644
--- a/src/commands/flows.test.ts
+++ b/src/commands/flows.test.ts
@@ -172,6 +172,27 @@ describe("flows commands", () => {
     });
   });
 
+  it("shows TaskFlows with Date-invalid timestamps without crashing", async () => {
+    await withTaskFlowCommandStateDir(async () => {
+      const flow = createManagedTaskFlow({
+        ownerKey: "agent:main:main",
+        controllerId: "tests/flows-command",
+        goal: "Inspect malformed flow timestamp",
+        status: "running",
+        createdAt: 100,
+        updatedAt: 8_700_000_000_000_000,
+      });
+
+      const runtime = createRuntime();
+      await flowsShowCommand({ lookup: flow.flowId, json: false }, runtime);
+
+      const lines = vi.mocked(runtime.log).mock.calls.map(([line]) => String(line));
+      expect(lines).toContain(`flowId: ${flow.flowId}`);
+      expect(lines).toContain("createdAt: 1970-01-01T00:00:00.100Z");
+      expect(lines).toContain("updatedAt: n/a");
+    });
+  });
+
   it("sanitizes TaskFlow text output before printing to the terminal", async () => {
     await withTaskFlowCommandStateDir(async () => {
       const unsafeOwnerKey = "agent:main:\u001b[31mowner";
diff --git a/src/commands/flows.ts b/src/commands/flows.ts
index 879da5983ef1..90cc4a93b783 100644
--- a/src/commands/flows.ts
+++ b/src/commands/flows.ts
@@ -4,6 +4,7 @@ import { formatCliCommand } from "../cli/command-format.js";
 import { getRuntimeConfig } from "../config/config.js";
 import { info } from "../globals.js";
 import type { RuntimeEnv } from "../runtime.js";
+import { timestampMsToIsoString } from "../shared/number-coercion.js";
 import { normalizeOptionalString } from "../shared/string-coerce.js";
 import { listTasksForFlowId } from "../tasks/runtime-internal.js";
 import { cancelFlowById, getFlowTaskSummary } from "../tasks/task-executor.js";
@@ -50,6 +51,10 @@ function shortToken(value: string | undefined, maxChars = ID_PAD): string {
   return truncate(trimmed, maxChars);
 }
 
+function formatFlowTimestamp(value: number | undefined | null): string {
+  return timestampMsToIsoString(value) ?? "n/a";
+}
+
 function formatFlowStatusCell(status: TaskFlowStatus, rich: boolean) {
   const padded = status.padEnd(STATUS_PAD);
   if (!rich) {
@@ -228,11 +233,11 @@ export async function flowsShowCommand(
     `notify: ${flow.notifyPolicy}`,
     ...(stateSummary ? [`state: ${safeFlowDisplayText(stateSummary)}`] : []),
     ...(flow.cancelRequestedAt
-      ? [`cancelRequestedAt: ${new Date(flow.cancelRequestedAt).toISOString()}`]
+      ? [`cancelRequestedAt: ${formatFlowTimestamp(flow.cancelRequestedAt)}`]
       : []),
-    `createdAt: ${new Date(flow.createdAt).toISOString()}`,
-    `updatedAt: ${new Date(flow.updatedAt).toISOString()}`,
-    `endedAt: ${flow.endedAt ? new Date(flow.endedAt).toISOString() : "n/a"}`,
+    `createdAt: ${formatFlowTimestamp(flow.createdAt)}`,
+    `updatedAt: ${formatFlowTimestamp(flow.updatedAt)}`,
+    `endedAt: ${formatFlowTimestamp(flow.endedAt)}`,
     `tasks: ${taskSummary.total} total · ${taskSummary.active} active · ${taskSummary.failures} issues`,
   ];
   for (const line of lines) {