diff --git a/openpilot/selfdrive/ui/layouts/arabesque/desktop.py b/openpilot/selfdrive/ui/layouts/arabesque/desktop.py
index d1e2f3f812..27a3c8d3fa 100644
--- a/openpilot/selfdrive/ui/layouts/arabesque/desktop.py
+++ b/openpilot/selfdrive/ui/layouts/arabesque/desktop.py
@@ -1,7 +1,13 @@
 from collections.abc import Callable
+from datetime import UTC
+from email.utils import parsedate_to_datetime
+import subprocess
+from threading import Event, Thread
 
 from openpilot.starpilot.ui.raylib import rl
 
+from openpilot.common.hardware import PC
+from openpilot.common.time_helpers import MIN_DATE, MAX_DATE
 from openpilot.selfdrive.ui.layouts.arabesque.theme import DEFAULT_THEME
 from openpilot.selfdrive.ui.layouts.arabesque.tools.browser import Browser
 from openpilot.selfdrive.ui.layouts.arabesque.tools.files import Files
@@ -27,6 +33,32 @@ class ArabesqueLayout(Widget):
     self._pressed_rect: rl.Rectangle | None = None
     self._active_tool: Widget | None = None
     self._active_name = ""
+    self._time_sync_thread: Thread | None = None
+    self._time_sync_cancelled = Event()
+
+  def show_event(self):
+    super().show_event()
+    if PC or not self._permitted() or self._time_sync_thread is not None and self._time_sync_thread.is_alive():
+      return
+    self._time_sync_cancelled = Event()
+    self._time_sync_thread = Thread(target=self._sync_time, args=(self._time_sync_cancelled,), daemon=True)
+    self._time_sync_thread.start()
+
+  def _sync_time(self, cancelled: Event):
+    try:
+      # shortcut: HTTP recovery time is unauthenticated, replace when an authenticated bootstrap source is available.
+      headers = subprocess.run(
+        ['curl', '-fsI', '-m', '10', '-H', 'Cache-Control: no-cache', 'http://www.google.com'],
+        stdin=subprocess.DEVNULL, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL, text=True, check=True, timeout=11,
+      ).stdout
+      date = next((line.partition(':')[2].strip() for line in headers.splitlines() if line.lower().startswith('date:')), '')
+      net_time = parsedate_to_datetime(date)
+      if net_time.tzinfo is None or not MIN_DATE < net_time.astimezone(UTC).replace(tzinfo=None) < MAX_DATE or cancelled.is_set():
+        return
+      subprocess.run(['sudo', '-n', 'date', '-u', '-s', net_time.isoformat()],
+                     stdin=subprocess.DEVNULL, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL, check=True, timeout=2)
+    except (OSError, ValueError, TypeError, OverflowError, subprocess.SubprocessError):
+      pass
 
   def _update_layout_rects(self):
     rect = self._rect
@@ -67,10 +99,14 @@ class ArabesqueLayout(Widget):
       tool.hide_event()
 
   def hide_event(self):
+    # MainLayout also hides this view when offroad access is revoked.
+    self._time_sync_cancelled.set()
     super().hide_event()
     self._close_tool()
 
   def poll_runtime(self, awake: bool):
+    if self._time_sync_cancelled.is_set() and self._time_sync_thread is not None and not self._time_sync_thread.is_alive():
+      self.show_event()
     if isinstance(self._active_tool, Browser):
       self._active_tool.poll_runtime(awake)
 
diff --git a/openpilot/selfdrive/ui/tests/test_arabesque.py b/openpilot/selfdrive/ui/tests/test_arabesque.py
index 88e6514eab..ae2036098f 100644
--- a/openpilot/selfdrive/ui/tests/test_arabesque.py
+++ b/openpilot/selfdrive/ui/tests/test_arabesque.py
@@ -5,6 +5,8 @@ from dataclasses import replace
 from enum import IntEnum
 import gc
 from pathlib import Path
+import subprocess
+from threading import Event
 from types import SimpleNamespace as NS
 from unittest.mock import Mock
 import weakref
@@ -35,6 +37,7 @@ def layout_classes(path, names, namespace):
 @pytest.fixture
 def shell(monkeypatch):
   import openpilot.system.ui.widgets as widgets
+  monkeypatch.setattr(desktop, 'PC', True)
   monkeypatch.setattr(widgets, 'device', NS(awake=True))
   monkeypatch.setattr(gui_app, '_mouse_events', [])
   monkeypatch.setattr(gui_app, '_show_touches', False)
@@ -425,6 +428,7 @@ def test_authority_revocation_closes_tool_without_rendering(main, probe):
   main.layout.poll_arabesque()
   assert main.layout._current_mode == main.state.ONROAD
   assert view._active_tool is None
+  assert view._time_sync_cancelled.is_set()
   probe.hide_event.assert_called_once()
 
 
@@ -492,3 +496,68 @@ def test_star_large_routes_shell_and_uses_confirmed_offroad(main, probe):
   assert view._active_tool is None
   layout.star.close.assert_called_once()
   layout._native_onroad.close.assert_called_once()
+
+
+def test_time_sync_startup_cancellation_and_reentry(shell, monkeypatch):
+  thread, run = Mock(), Mock(return_value=NS(stdout='dAtE: Mon, 02 Nov 2026 18:00:00 GMT\r\n'))
+  monkeypatch.setattr(desktop, 'Thread', thread)
+  monkeypatch.setattr(desktop.subprocess, 'run', run)
+  shell.show_event()
+  thread.assert_not_called()
+  monkeypatch.setattr(desktop, 'PC', False)
+  shell._permitted = Mock(return_value=False)
+  shell.show_event()
+  thread.assert_not_called()
+  shell._permitted.return_value = True
+  shell.show_event()
+  run.assert_not_called()
+  assert thread.call_args.kwargs['daemon']
+  thread.return_value.start.assert_called_once()
+  shell.show_event()
+  thread.assert_called_once()
+  shell.hide_event()
+  shell.show_event()
+  shell.poll_runtime(True)
+  thread.assert_called_once()
+  thread.call_args.kwargs['target'](*thread.call_args.kwargs['args'])
+  assert run.call_count == 1  # Closing cancels the correction after the request returns.
+  thread.return_value.is_alive.return_value = False
+  shell._permitted.return_value = False
+  shell.poll_runtime(True)
+  thread.assert_called_once()
+  shell._permitted.return_value = True
+  shell.poll_runtime(True)
+  assert thread.call_count == 2
+  thread.call_args.kwargs['target'](*thread.call_args.kwargs['args'])
+  assert run.call_count == 3
+  fetch, apply = run.call_args_list[-2:]
+  assert fetch.args[0] == ['curl', '-fsI', '-m', '10', '-H', 'Cache-Control: no-cache', 'http://www.google.com']
+  assert fetch.kwargs['timeout'] == 11
+  assert apply.args[0] == ['sudo', '-n', 'date', '-u', '-s', '2026-11-02T18:00:00+00:00']
+  assert apply.kwargs['timeout'] == 2
+  assert apply.kwargs['stdout'] == apply.kwargs['stderr'] == subprocess.DEVNULL
+  shell.poll_runtime(True)
+  assert thread.call_count == 2
+
+
+@pytest.mark.parametrize('response', [
+  '', 'HTTP/1.1 200 OK\r\n', 'Date: invalid\r\n',
+  'Date: Sat, 01 Jan 2000 00:00:00 GMT\r\n', 'Date: Tue, 01 Jan 2036 00:00:00 GMT\r\n',
+  'Date: Mon, 02 Nov 2026 18:00:00\r\n',
+  subprocess.CalledProcessError(22, ['curl'], output='Date: Mon, 02 Nov 2026 18:00:00 GMT\r\n'),
+  subprocess.CalledProcessError(28, ['curl'], output='Date: Mon, 02 Nov 2026 18:00:00 GMT\r\n'),
+  subprocess.TimeoutExpired(['curl'], 11), FileNotFoundError('curl'),
+])
+def test_failed_or_invalid_time_sync_never_sets_clock(shell, monkeypatch, response):
+  run = Mock(side_effect=response) if isinstance(response, Exception) else Mock(return_value=NS(stdout=response))
+  monkeypatch.setattr(desktop.subprocess, 'run', run)
+  shell._sync_time(Event())
+  assert run.call_count == 1
+
+
+@pytest.mark.parametrize('error', [subprocess.CalledProcessError(1, ['sudo']), subprocess.TimeoutExpired(['sudo'], 2), FileNotFoundError('sudo')])
+def test_time_sync_permission_or_command_failures_stay_quiet(shell, monkeypatch, error):
+  run = Mock(side_effect=[NS(stdout='Date: Mon, 02 Nov 2026 18:00:00 GMT\r\n'), error])
+  monkeypatch.setattr(desktop.subprocess, 'run', run)
+  shell._sync_time(Event())
+  assert run.call_count == 2