@@ -0,0 +1,19 @@
+---
+'@object-ui/fields': patch
+'@object-ui/i18n': patch
+'@object-ui/cli': patch
+---
+
+feat(fields): a notification preference's quiet hours are drawn as a time-zone picker and two times, not a JSON box
+
+Clause-②: yes
+Metadata-protocol: none
+
+`@object-ui/fields` registers `field:quiet-hours` for a field that declares `widget: 'quiet-hours'`: a daily window when notifications are held, stored as `{ tz?, start: 'HH:MM', end: 'HH:MM' }`. The stored shape does not change. The control appears in Setup once `sys_notification_preference.quiet_hours` declares the hint; until then the field keeps the JSON editor.
+
+- **Writes.** Exactly `{ tz?, start, end }` once both times are set, and `null` once both are cleared. One time without the other writes nothing and marks the missing time invalid, so the form does not submit. Choosing a zone alone writes nothing.
+- **Reads.** A stored window is read back into the control with each part kept as stored, so a part nobody edits is written back unchanged. A window without `tz` reads as UTC and stays without `tz` until a zone is chosen. A window whose start is later than its end runs past midnight, and the control says so; a window whose start and end are the same minute holds nothing, and the control says that too.
+- **Time zones.** UTC first, then every zone `Intl.supportedValuesOf('timeZone')` lists that the `iana_time_zone` value domain accepts. A stored zone outside the list stays on screen, marked "not in the list", and is written back as stored.
+- **Unreadable values.** A stored value of any other shape is shown as stored with a note, and is replaced only when the person chooses to set a new range and fills both times.
+- **Strings.** Ten new `fields.quietHours.*` keys in every built-in language pack (`zh-Hant` regenerated from `zh-Hans`).
+- `@object-ui/cli`'s known component types gain `field:quiet-hours`.
@@ -182,6 +182,7 @@ export const PARAM_VALUE_SHAPES: Readonly<Record<string, ParamValueShapeSpec>> =
   'permission-ref': { base: 'string', cardinality: 'scalar', widgetHintOnly: true, note: 'Permission-set name string. Widget-hint only — not a declarable param type.' },
   'notification-topic': { base: 'string', cardinality: 'scalar', widgetHintOnly: true, note: 'Notification topic string. Widget-hint only — not a declarable param type.' },
   'notification-channel': { base: 'string', cardinality: 'scalar', widgetHintOnly: true, note: 'Notification channel string. Widget-hint only — not a declarable param type.' },
+  'quiet-hours': { base: 'object', cardinality: 'scalar', widgetHintOnly: true, note: 'Quiet-hours window { tz?, start, end } object (null when empty). Widget-hint only — not a declarable param type.' },
 });
 
 /** Concrete `base[]` tag for a base shape. */
 
@@ -158,6 +158,7 @@ export const KNOWN_SCHEMA_TYPES: readonly string[] = [
   'field:position-ref',
   'field:progress',
   'field:qrcode',
+  'field:quiet-hours',
   'field:radio',
   'field:rating',
   'field:recipient-picker',
 
@@ -190,7 +190,7 @@ export const INLINE_EXCLUDED_FIELD_TYPES = new Set<string>([
   // sibling fields / a loaded object catalog), not inline in a grid cell.
   'object-ref', 'shareable-object-ref', 'filter-condition', 'recipient-picker',
   'position-ref', 'permission-ref',
-  'notification-topic', 'notification-channel',
+  'notification-topic', 'notification-channel', 'quiet-hours',
 ]);
 
 /** Field types whose value is chosen in one discrete gesture (no free typing). */
 
@@ -71,6 +71,8 @@ const GROUP_LABELLED = [
   'slider',
   'signature',
   'grid',
+  // A time-zone picker and two time inputs under one label (objectstack#31421).
+  'quiet-hours',
 ] as const;
 
 /**
 
@@ -141,6 +141,7 @@ import {
   NotificationTopicField,
   NotificationChannelField,
 } from '../widgets/RegistryRefField';
+import { QuietHoursField } from '../widgets/QuietHoursField';
 
 /** Same widget map as the #3291 sweep, so the parity check covers the registry. */
 const WIDGETS: Record<string, ComponentType<any>> = {
@@ -197,6 +198,7 @@ const WIDGETS: Record<string, ComponentType<any>> = {
   'permission-ref': PermissionRefField,
   'notification-topic': NotificationTopicField,
   'notification-channel': NotificationChannelField,
+  'quiet-hours': QuietHoursField,
 };
 
 /**
 
@@ -151,6 +151,7 @@ import {
   NotificationTopicField,
   NotificationChannelField,
 } from '../widgets/RegistryRefField';
+import { QuietHoursField } from '../widgets/QuietHoursField';
 
 /* ════════════════════════════════════════════════════════════════════════════
  * Every registered field widget, both hosts
@@ -216,6 +217,7 @@ const WIDGETS: Record<string, ComponentType<any>> = {
   'permission-ref': PermissionRefField,
   'notification-topic': NotificationTopicField,
   'notification-channel': NotificationChannelField,
+  'quiet-hours': QuietHoursField,
 };
 
 /** Option widgets render an "unfillable" placeholder unless offered a list. */
 
@@ -4728,6 +4728,10 @@ const fieldWidgetMap = {
   //   notification-channel → a notification channel, `*` for all
   'notification-topic': () => import('./widgets/RegistryRefField.js').then(m => ({ default: m.NotificationTopicField })),
   'notification-channel': () => import('./widgets/RegistryRefField.js').then(m => ({ default: m.NotificationChannelField })),
+  // A notification preference's quiet hours: a daily window stored as
+  // `{ tz?, start: 'HH:MM', end: 'HH:MM' }`, drawn as a time-zone picker and
+  // two times.
+  'quiet-hours': () => import('./widgets/QuietHoursField.js').then(m => ({ default: m.QuietHoursField })),
 } satisfies Record<string, FieldWidgetLoader>;
 
 /** The registered field widget keys, as a literal union (objectui#4857). */
@@ -4913,6 +4917,7 @@ const FIELD_TYPES_SKIP_FALLBACK = new Set([
   'permission-ref',
   'notification-topic',
   'notification-channel',
+  'quiet-hours',
   // ── Retired bare node keys (objectui#10859 batch 8) ───────────────────────
   // Each was registered bare only as this loop's fallback: no other package
   // owns the name, no form path reads it, and no document authors it as a
@@ -5064,6 +5069,7 @@ export const FIELD_WIDGET_LABELLING: Record<
   'permission-ref': 'control',
   'notification-topic': 'control',
   'notification-channel': 'control',
+  'quiet-hours': 'group',
 };
 
 export function registerField(fieldType: string): void {