diff --git a/extensions/active-memory/index.test.ts b/extensions/active-memory/index.test.ts
index ccc130274a5..f37692e92f7 100644
--- a/extensions/active-memory/index.test.ts
+++ b/extensions/active-memory/index.test.ts
@@ -4130,6 +4130,50 @@ describe("active-memory plugin", () => {
     expect(cached?.summary).toBe("memory 1");
   });
 
+  it("drops cached active-memory results when the current clock is not a valid date timestamp", () => {
+    const nowSpy = vi.spyOn(Date, "now").mockReturnValue(1_700_000_000_000);
+    const cacheKey = testing.buildCacheKey({
+      agentId: "main",
+      sessionKey: "agent:main:invalid-clock-cache",
+      query: "cache invalid clock prompt",
+    });
+    testing.setCachedResult(
+      cacheKey,
+      {
+        status: "ok",
+        elapsedMs: 1,
+        rawReply: "memory",
+        summary: "memory",
+      },
+      15_000,
+    );
+
+    nowSpy.mockReturnValue(Number.NaN);
+
+    expect(testing.getCachedResult(cacheKey)).toBeUndefined();
+  });
+
+  it("does not cache active-memory results when the expiry timestamp would exceed the valid date range", () => {
+    vi.spyOn(Date, "now").mockReturnValue(8_640_000_000_000_000);
+    const cacheKey = testing.buildCacheKey({
+      agentId: "main",
+      sessionKey: "agent:main:overflow-cache",
+      query: "cache overflow prompt",
+    });
+    testing.setCachedResult(
+      cacheKey,
+      {
+        status: "ok",
+        elapsedMs: 1,
+        rawReply: "memory",
+        summary: "memory",
+      },
+      15_000,
+    );
+
+    expect(testing.getCachedResult(cacheKey)).toBeUndefined();
+  });
+
   it("skips recall after consecutive timeouts when circuit breaker trips (#74054)", async () => {
     const CONFIGURED_TIMEOUT_MS = 25;
     testing.setMinimumTimeoutMsForTests(1);
diff --git a/extensions/active-memory/index.ts b/extensions/active-memory/index.ts
index 0bbc9f79602..4fef112d89e 100644
--- a/extensions/active-memory/index.ts
+++ b/extensions/active-memory/index.ts
@@ -13,7 +13,11 @@ import {
 } from "openclaw/plugin-sdk/agent-runtime";
 import type { OpenClawConfig } from "openclaw/plugin-sdk/config-contracts";
 import { closeActiveMemorySearchManager } from "openclaw/plugin-sdk/memory-host-search";
-import { parseStrictPositiveInteger } from "openclaw/plugin-sdk/number-runtime";
+import {
+  asDateTimestampMs,
+  parseStrictPositiveInteger,
+  resolveExpiresAtMsFromDurationMs,
+} from "openclaw/plugin-sdk/number-runtime";
 import {
   resolveLivePluginConfigObject,
   resolvePluginConfigObject,
@@ -1360,7 +1364,12 @@ function getCachedResult(cacheKey: string): ActiveRecallResult | undefined {
   if (!cached) {
     return undefined;
   }
-  if (cached.expiresAt <= Date.now()) {
+  const now = asDateTimestampMs(Date.now());
+  if (
+    now === undefined ||
+    asDateTimestampMs(cached.expiresAt) === undefined ||
+    cached.expiresAt <= now
+  ) {
     activeRecallCache.delete(cacheKey);
     return undefined;
   }
@@ -1368,19 +1377,27 @@ function getCachedResult(cacheKey: string): ActiveRecallResult | undefined {
 }
 
 function setCachedResult(cacheKey: string, result: ActiveRecallResult, ttlMs: number): void {
-  const now = Date.now();
+  const rawNow = Date.now();
+  const now = asDateTimestampMs(rawNow);
   if (
     activeRecallCache.size >= DEFAULT_MAX_CACHE_ENTRIES ||
-    now - lastActiveRecallCacheSweepAt >= CACHE_SWEEP_INTERVAL_MS
+    (now !== undefined && now - lastActiveRecallCacheSweepAt >= CACHE_SWEEP_INTERVAL_MS)
   ) {
     sweepExpiredCacheEntries(now);
-    lastActiveRecallCacheSweepAt = now;
+    if (now !== undefined) {
+      lastActiveRecallCacheSweepAt = now;
+    }
+  }
+  const expiresAt = resolveExpiresAtMsFromDurationMs(ttlMs, { nowMs: rawNow });
+  if (expiresAt === undefined) {
+    activeRecallCache.delete(cacheKey);
+    return;
   }
   if (activeRecallCache.has(cacheKey)) {
     activeRecallCache.delete(cacheKey);
   }
   activeRecallCache.set(cacheKey, {
-    expiresAt: now + ttlMs,
+    expiresAt,
     result,
   });
   while (activeRecallCache.size > DEFAULT_MAX_CACHE_ENTRIES) {
@@ -1392,9 +1409,13 @@ function setCachedResult(cacheKey: string, result: ActiveRecallResult, ttlMs: nu
   }
 }
 
-function sweepExpiredCacheEntries(now = Date.now()): void {
+function sweepExpiredCacheEntries(now = asDateTimestampMs(Date.now())): void {
+  if (now === undefined) {
+    activeRecallCache.clear();
+    return;
+  }
   for (const [cacheKey, cached] of activeRecallCache.entries()) {
-    if (cached.expiresAt <= now) {
+    if (asDateTimestampMs(cached.expiresAt) === undefined || cached.expiresAt <= now) {
       activeRecallCache.delete(cacheKey);
     }
   }