diff --git a/extensions/qqbot/src/engine/tools/remind-logic.test.ts b/extensions/qqbot/src/engine/tools/remind-logic.test.ts
index b734c236b374..c2119cdf9fa6 100644
--- a/extensions/qqbot/src/engine/tools/remind-logic.test.ts
+++ b/extensions/qqbot/src/engine/tools/remind-logic.test.ts
@@ -59,6 +59,54 @@ describe("engine/tools/remind-logic", () => {
       });
     });
 
+    it.each([
+      {
+        name: "uses the Gateway timezone when omitted",
+        timezone: undefined,
+        expectedSchedule: { kind: "cron", expr: "0 9 * * *" },
+        expectedSummary: '⏰ Recurring reminder: "test reminder" (0 9 * * *, tz=gateway local)',
+      },
+      {
+        name: "preserves an explicit IANA timezone",
+        timezone: " America/New_York ",
+        expectedSchedule: {
+          kind: "cron",
+          expr: "0 9 * * *",
+          tz: "America/New_York",
+        },
+        expectedSummary: '⏰ Recurring reminder: "test reminder" (0 9 * * *, tz=America/New_York)',
+      },
+    ])("$name for recurring reminders", async ({ timezone, expectedSchedule, expectedSummary }) => {
+      const calls: RemindCronAction[] = [];
+      const result = await executeScheduledRemind(
+        {
+          action: "add",
+          content: "test reminder",
+          to: "qqbot:c2c:123",
+          time: "0 9 * * *",
+          ...(timezone ? { timezone } : {}),
+        },
+        {},
+        async (params) => {
+          calls.push(params);
+          return { id: "job-cron" };
+        },
+      );
+
+      const call = calls[0];
+      expect(call?.action).toBe("add");
+      if (call?.action !== "add") {
+        throw new Error("expected add cron action");
+      }
+      expect(call.job.schedule).toEqual(expectedSchedule);
+      expect(result.details).toEqual({
+        ok: true,
+        action: "add",
+        summary: expectedSummary,
+        cronResult: { id: "job-cron" },
+      });
+    });
+
     it("runs cron list and remove through the scheduler", async () => {
       const calls: unknown[] = [];
       await executeScheduledRemind({ action: "list" }, {}, async (params) => {
diff --git a/extensions/qqbot/src/engine/tools/remind-logic.ts b/extensions/qqbot/src/engine/tools/remind-logic.ts
index 6db64039591f..827696164c76 100644
--- a/extensions/qqbot/src/engine/tools/remind-logic.ts
+++ b/extensions/qqbot/src/engine/tools/remind-logic.ts
@@ -27,8 +27,6 @@ export interface RemindParams {
   jobId?: string;
 }
 
-const QQBOT_DEFAULT_REMINDER_TIMEZONE = "Asia/Shanghai";
-
 /**
  * Context supplied by the bridge layer so the engine can remain free of
  * framework / AsyncLocalStorage dependencies. `fallbackTo` and
@@ -99,7 +97,7 @@ export const RemindSchema = {
     timezone: {
       type: "string",
       description:
-        "Optional IANA timezone used for cron reminders. Include it when the user provides or confirms a timezone; if omitted, QQBot preserves its existing default timezone.",
+        "Optional IANA timezone used for cron reminders. Include it when the user provides or confirms a timezone; if omitted, Gateway cron uses the host timezone.",
     },
     name: {
       type: "string",
@@ -226,12 +224,16 @@ function buildOnceJob(params: RemindParams, atMs: number, to: string, accountId:
 function buildCronJob(params: RemindParams, to: string, accountId: string) {
   const content = params.content!;
   const name = params.name || generateJobName(content);
-  const tz = params.timezone || QQBOT_DEFAULT_REMINDER_TIMEZONE;
+  const timezone = params.timezone?.trim();
   return {
     action: "add" as const,
     job: {
       name,
-      schedule: { kind: "cron" as const, expr: params.time!.trim(), tz },
+      schedule: {
+        kind: "cron" as const,
+        expr: params.time!.trim(),
+        ...(timezone ? { tz: timezone } : {}),
+      },
       sessionTarget: "isolated" as const,
       wakeMode: "now" as const,
       payload: {
@@ -309,11 +311,12 @@ function prepareRemindCronAction(
   const resolvedAccountId = ctx.fallbackAccountId || "default";
 
   if (isCronExpression(params.time)) {
+    const timezone = params.timezone?.trim();
     return {
       ok: true,
       action: "add",
       cronAction: buildCronJob(params, resolvedTo, resolvedAccountId),
-      summary: `⏰ Recurring reminder: "${params.content}" (${params.time}, tz=${params.timezone || QQBOT_DEFAULT_REMINDER_TIMEZONE})`,
+      summary: `⏰ Recurring reminder: "${params.content}" (${params.time}, tz=${timezone || "gateway local"})`,
     };
   }