diff --git a/extensions/telegram/src/error-policy.test.ts b/extensions/telegram/src/error-policy.test.ts
index 741021d0d35..69c58e2f919 100644
--- a/extensions/telegram/src/error-policy.test.ts
+++ b/extensions/telegram/src/error-policy.test.ts
@@ -1,3 +1,4 @@
+import { MAX_DATE_TIMESTAMP_MS } from "openclaw/plugin-sdk/number-runtime";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 import {
   buildTelegramErrorScopeKey,
@@ -120,6 +121,72 @@ describe("telegram error policy", () => {
     ).toBe(false);
   });
 
+  it("does not suppress or keep cooldowns when the process clock is invalid", () => {
+    const scopeKey = buildTelegramErrorScopeKey({
+      accountId: "work",
+      chatId: 42,
+    });
+
+    expect(
+      shouldSuppressTelegramError({
+        scopeKey,
+        cooldownMs: 1000,
+        errorMessage: "429",
+      }),
+    ).toBe(false);
+    expect(
+      shouldSuppressTelegramError({
+        scopeKey,
+        cooldownMs: 1000,
+        errorMessage: "429",
+      }),
+    ).toBe(true);
+
+    const nowSpy = vi.spyOn(Date, "now").mockReturnValue(Number.NaN);
+    try {
+      expect(
+        shouldSuppressTelegramError({
+          scopeKey,
+          cooldownMs: 1000,
+          errorMessage: "429",
+        }),
+      ).toBe(false);
+    } finally {
+      nowSpy.mockRestore();
+    }
+    expect(
+      shouldSuppressTelegramError({
+        scopeKey,
+        cooldownMs: 1000,
+        errorMessage: "429",
+      }),
+    ).toBe(false);
+  });
+
+  it("does not store cooldowns whose expiry would exceed the Date range", () => {
+    const scopeKey = buildTelegramErrorScopeKey({
+      accountId: "work",
+      chatId: 42,
+    });
+    vi.setSystemTime(MAX_DATE_TIMESTAMP_MS);
+
+    expect(
+      shouldSuppressTelegramError({
+        scopeKey,
+        cooldownMs: 1000,
+        errorMessage: "429",
+      }),
+    ).toBe(false);
+    vi.setSystemTime(new Date("2026-01-01T00:00:00Z"));
+    expect(
+      shouldSuppressTelegramError({
+        scopeKey,
+        cooldownMs: 1000,
+        errorMessage: "429",
+      }),
+    ).toBe(false);
+  });
+
   it("does not leak suppression across accounts or threads", () => {
     const workMain = buildTelegramErrorScopeKey({
       accountId: "work",
diff --git a/extensions/telegram/src/error-policy.ts b/extensions/telegram/src/error-policy.ts
index 90f18b2a714..b7a01547945 100644
--- a/extensions/telegram/src/error-policy.ts
+++ b/extensions/telegram/src/error-policy.ts
@@ -4,6 +4,11 @@ import type {
   TelegramGroupConfig,
   TelegramTopicConfig,
 } from "openclaw/plugin-sdk/config-contracts";
+import {
+  asDateTimestampMs,
+  isFutureDateTimestampMs,
+  resolveExpiresAtMsFromDurationMs,
+} from "openclaw/plugin-sdk/number-runtime";
 
 type TelegramErrorPolicy = "always" | "once" | "silent";
 
@@ -18,7 +23,7 @@ const DEFAULT_ERROR_COOLDOWN_MS = 14400000;
 
 function pruneExpiredCooldowns(messageStore: Map<string, number>, now: number) {
   for (const [message, expiresAt] of messageStore) {
-    if (expiresAt <= now) {
+    if (!isFutureDateTimestampMs(expiresAt, { nowMs: now })) {
       messageStore.delete(message);
     }
   }
@@ -67,9 +72,13 @@ export function shouldSuppressTelegramError(params: {
   errorMessage?: string;
 }): boolean {
   const { scopeKey, cooldownMs, errorMessage } = params;
-  const now = Date.now();
+  const now = asDateTimestampMs(Date.now());
   const messageKey = errorMessage ?? "";
   const scopeStore = errorCooldownStore.get(scopeKey);
+  if (now === undefined) {
+    errorCooldownStore.delete(scopeKey);
+    return false;
+  }
 
   if (scopeStore) {
     pruneExpiredCooldowns(scopeStore, now);
@@ -88,12 +97,17 @@ export function shouldSuppressTelegramError(params: {
   }
 
   const expiresAt = scopeStore?.get(messageKey);
-  if (typeof expiresAt === "number" && expiresAt > now) {
+  if (isFutureDateTimestampMs(expiresAt, { nowMs: now })) {
     return true;
   }
 
+  const nextExpiresAt = resolveExpiresAtMsFromDurationMs(cooldownMs, { nowMs: now });
+  if (nextExpiresAt === undefined) {
+    scopeStore?.delete(messageKey);
+    return false;
+  }
   const nextScopeStore = scopeStore ?? new Map<string, number>();
-  nextScopeStore.set(messageKey, now + cooldownMs);
+  nextScopeStore.set(messageKey, nextExpiresAt);
   errorCooldownStore.set(scopeKey, nextScopeStore);
   return false;
 }