diff --git a/vehicle-data-platform/apps/web/src/App.tsx b/vehicle-data-platform/apps/web/src/App.tsx
index 33f9653d..74f1d546 100644
--- a/vehicle-data-platform/apps/web/src/App.tsx
+++ b/vehicle-data-platform/apps/web/src/App.tsx
@@ -37,6 +37,7 @@ export default function App() {
   const [qualityFilters, setQualityFilters] = useState<Record<string, string>>(
     initialRoute.page === 'quality' || initialRoute.page === 'alert-events' ? qualityFiltersFromRoute(initialRoute) : {}
   );
+  const [customerTimeWindow, setCustomerTimeWindow] = useState<Record<string, string>>(timeWindowFiltersFromRoute(initialRoute));
   const [linkIssueCount, setLinkIssueCount] = useState<number | null>(null);
   const [activeAlertRuleCount, setActiveAlertRuleCount] = useState<number | null>(null);
   const [p0AlertRuleCount, setP0AlertRuleCount] = useState<number | null>(null);
@@ -143,6 +144,10 @@ export default function App() {
       if (route.page === 'quality' || route.page === 'alert-events') {
         setQualityFilters(qualityFiltersFromRoute(route));
       }
+      const routeTimeWindow = timeWindowFiltersFromRoute(route);
+      if (routeTimeWindow.dateFrom || routeTimeWindow.dateTo) {
+        setCustomerTimeWindow(routeTimeWindow);
+      }
       setActiveProtocol(route.protocol ?? '');
       setHistoryTab(route.filters?.tab ?? (route.page === 'history-query' ? 'raw' : 'location'));
     };
@@ -446,6 +451,14 @@ export default function App() {
   };
 
   const currentCustomerTaskTimeWindow = () => {
+    const globalDateFrom = customerTimeWindow.dateFrom?.trim();
+    const globalDateTo = customerTimeWindow.dateTo?.trim();
+    if (globalDateFrom || globalDateTo) {
+      return {
+        ...(globalDateFrom ? { dateFrom: globalDateFrom } : {}),
+        ...(globalDateTo ? { dateTo: globalDateTo } : {})
+      };
+    }
     const candidates = activePage === 'mileage'
       ? [mileageFilters, historyFilters, qualityFilters]
       : activePage === 'history' || activePage === 'history-query'
@@ -535,12 +548,19 @@ export default function App() {
   };
 
   return (
-    <AppShell activePage={activePage} linkIssueCount={linkIssueCount} activeAlertRuleCount={activeAlertRuleCount} p0AlertRuleCount={p0AlertRuleCount} platformRelease={platformRelease} currentVehicleStatus={currentVehicleStatus} currentVehicleLabel={currentVehicleLabel} currentVehicleConsistency={currentVehicleConsistency} onChange={navigatePage} onCustomerTask={openCustomerTask} onVehicleSearch={openVehicle}>
+    <AppShell activePage={activePage} linkIssueCount={linkIssueCount} activeAlertRuleCount={activeAlertRuleCount} p0AlertRuleCount={p0AlertRuleCount} platformRelease={platformRelease} currentVehicleStatus={currentVehicleStatus} currentVehicleLabel={currentVehicleLabel} currentVehicleConsistency={currentVehicleConsistency} customerTimeWindow={customerTimeWindow} onCustomerTimeWindowChange={setCustomerTimeWindow} onChange={navigatePage} onCustomerTask={openCustomerTask} onVehicleSearch={openVehicle}>
       {pages[activePage]}
     </AppShell>
   );
 }
 
+function timeWindowFiltersFromRoute(route: ReturnType<typeof parseAppHash>): Record<string, string> {
+  return {
+    ...(route.filters?.dateFrom ? { dateFrom: route.filters.dateFrom } : {}),
+    ...(route.filters?.dateTo ? { dateTo: route.filters.dateTo } : {})
+  };
+}
+
 function qualityFiltersFromRoute(route: ReturnType<typeof parseAppHash>): Record<string, string> {
   return {
     ...(route.keyword ? { keyword: route.keyword } : {}),
diff --git a/vehicle-data-platform/apps/web/src/layout/AppShell.tsx b/vehicle-data-platform/apps/web/src/layout/AppShell.tsx
index a680b74e..2e24cf45 100644
--- a/vehicle-data-platform/apps/web/src/layout/AppShell.tsx
+++ b/vehicle-data-platform/apps/web/src/layout/AppShell.tsx
@@ -130,6 +130,8 @@ export function AppShell({
   currentVehicleStatus,
   currentVehicleLabel,
   currentVehicleConsistency,
+  customerTimeWindow,
+  onCustomerTimeWindowChange,
   onChange,
   onCustomerTask,
   onVehicleSearch,
@@ -143,6 +145,8 @@ export function AppShell({
   currentVehicleStatus?: VehicleServiceStatus;
   currentVehicleLabel?: string;
   currentVehicleConsistency?: VehicleSourceConsistency;
+  customerTimeWindow?: Record<string, string>;
+  onCustomerTimeWindowChange?: (filters: Record<string, string>) => void;
   onChange: (page: PageKey) => void;
   onCustomerTask?: (page: PageKey) => void;
   onVehicleSearch: (keyword: string) => void | Promise<void>;
@@ -154,6 +158,8 @@ export function AppShell({
   const alertLabel = alertButtonLabel(linkIssueCount, activeAlertRuleCount, p0AlertRuleCount);
   const alertClassName = alertButtonClassName(linkIssueCount, activeAlertRuleCount, p0AlertRuleCount);
   const selectedPage = activePage === 'quality' ? 'alert-events' : activePage;
+  const dateFrom = customerTimeWindow?.dateFrom ?? '';
+  const dateTo = customerTimeWindow?.dateTo ?? '';
 
   const search = () => {
     const value = keyword.trim();
@@ -258,6 +264,26 @@ export function AppShell({
               <Button theme="solid" type="primary" loading={searching} onClick={search}>查询车辆</Button>
             </Space>
             <div className="vp-topbar-context">
+              <div className="vp-topbar-time-window" aria-label="客户时间窗">
+                <label>
+                  <span>开始</span>
+                  <input
+                    aria-label="顶部时间窗开始"
+                    type="date"
+                    value={dateFrom}
+                    onChange={(event) => onCustomerTimeWindowChange?.({ dateFrom: event.currentTarget.value, dateTo })}
+                  />
+                </label>
+                <label>
+                  <span>结束</span>
+                  <input
+                    aria-label="顶部时间窗结束"
+                    type="date"
+                    value={dateTo}
+                    onChange={(event) => onCustomerTimeWindowChange?.({ dateFrom, dateTo: event.currentTarget.value })}
+                  />
+                </label>
+              </div>
               {currentVehicleLabel ? <Tag color="grey">{currentVehicleLabel}</Tag> : null}
               {currentVehicleStatus ? (
                 <Tag color={currentVehicleStatus.severity === 'ok' ? 'green' : currentVehicleStatus.severity === 'error' ? 'red' : 'orange'}>
diff --git a/vehicle-data-platform/apps/web/src/styles/global.css b/vehicle-data-platform/apps/web/src/styles/global.css
index 7d356fcd..3bedb584 100644
--- a/vehicle-data-platform/apps/web/src/styles/global.css
+++ b/vehicle-data-platform/apps/web/src/styles/global.css
@@ -266,6 +266,42 @@ body {
   white-space: nowrap;
 }
 
+.vp-topbar-time-window {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  padding: 2px;
+  border: 1px solid var(--vp-border);
+  border-radius: 8px;
+  background: #f8fafc;
+}
+
+.vp-topbar-time-window label {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  height: 28px;
+  padding: 0 6px;
+  color: var(--vp-text-muted);
+  font-size: 12px;
+  font-weight: 600;
+}
+
+.vp-topbar-time-window input {
+  width: 118px;
+  height: 24px;
+  border: 0;
+  border-radius: 6px;
+  background: #ffffff;
+  color: var(--vp-text);
+  font-size: 12px;
+  outline: none;
+}
+
+.vp-topbar-time-window input:focus {
+  box-shadow: 0 0 0 2px rgba(22, 119, 255, 0.16);
+}
+
 .vp-topbar-quick-actions {
   height: 32px;
   display: inline-flex;
diff --git a/vehicle-data-platform/apps/web/src/test/App.test.tsx b/vehicle-data-platform/apps/web/src/test/App.test.tsx
index dbf037a7..bb95033c 100644
--- a/vehicle-data-platform/apps/web/src/test/App.test.tsx
+++ b/vehicle-data-platform/apps/web/src/test/App.test.tsx
@@ -6534,6 +6534,71 @@ test('applies protocol from shareable history hash to API requests', async () =>
   expect(window.location.hash).toBe('#/alert-events?keyword=%E7%B2%A4AG18312&protocol=JT808&dateFrom=2026-07-01&dateTo=2026-07-03');
 });
 
+test('topbar customer time window scopes vehicle service tasks', async () => {
+  window.history.replaceState(null, '', '/#/dashboard');
+  vi.spyOn(globalThis, 'fetch').mockImplementation(async (input) => {
+    const path = String(input);
+    if (path.includes('/api/vehicle-service/overview')) {
+      return {
+        ok: true,
+        json: async () => ({
+          data: {
+            vin: 'VIN-TOPBAR-WINDOW',
+            plate: '粤A时间窗',
+            primaryProtocol: 'JT808',
+            protocols: ['JT808'],
+            coverageStatus: 'online',
+            sourceCount: 1,
+            onlineSourceCount: 1,
+            realtimeCount: 1,
+            historyCount: 8,
+            rawCount: 20,
+            mileageCount: 3,
+            qualityIssueCount: 0
+          },
+          traceId: 'trace-test',
+          timestamp: 1783094400000
+        })
+      } as Response;
+    }
+    if (path.includes('/api/ops/health')) {
+      return {
+        ok: true,
+        json: async () => ({
+          data: { linkHealth: [], kafkaLag: 0, redisOnlineKeys: 0, tdengineWritable: true, mysqlWritable: true, runtime: { requestTimeoutMs: 5000 } },
+          traceId: 'trace-test',
+          timestamp: 1783094400000
+        })
+      } as Response;
+    }
+    return {
+      ok: true,
+      json: async () => ({
+        data: { items: [], total: 0, limit: 10, offset: 0 },
+        traceId: 'trace-test',
+        timestamp: 1783094400000
+      })
+    } as Response;
+  });
+
+  render(<App />);
+
+  fireEvent.change(screen.getByPlaceholderText('搜索 VIN / 车牌 / 手机号'), { target: { value: '粤A时间窗' } });
+  fireEvent.change(screen.getByLabelText('顶部时间窗开始'), { target: { value: '2026-07-01' } });
+  fireEvent.change(screen.getByLabelText('顶部时间窗结束'), { target: { value: '2026-07-03' } });
+  fireEvent.click(screen.getByRole('button', { name: '查询车辆' }));
+  expect(await screen.findByText('粤A时间窗 / VIN-TOPBAR-WINDOW')).toBeInTheDocument();
+
+  fireEvent.click(screen.getByRole('button', { name: '顶部统计查询' }));
+  expect(window.location.hash).toBe('#/mileage?keyword=VIN-TOPBAR-WINDOW&protocol=JT808&dateFrom=2026-07-01&dateTo=2026-07-03');
+
+  fireEvent.click(screen.getByRole('button', { name: '顶部数据导出' }));
+  expect(window.location.hash).toBe('#/history-query?keyword=VIN-TOPBAR-WINDOW&protocol=JT808&tab=raw&dateFrom=2026-07-01&dateTo=2026-07-03');
+
+  fireEvent.click(await screen.findByRole('button', { name: '顶部告警事件正常' }));
+  expect(window.location.hash).toBe('#/alert-events?keyword=VIN-TOPBAR-WINDOW&protocol=JT808&dateFrom=2026-07-01&dateTo=2026-07-03');
+});
+
 test('shows and clears current history filters while keeping vehicle scope', async () => {
   window.history.replaceState(null, '', '/#/history-query?keyword=VIN-HISTORY-001&protocol=JT808&dateFrom=2026-07-01+00%3A00%3A00&dateTo=2026-07-01+23%3A59%3A59&includeFields=true&fields=jt808.location.longitude%2Cjt808.location.latitude&tab=raw');
   const fetchMock = vi.spyOn(globalThis, 'fetch').mockImplementation(async (input, init) => {