diff --git a/.changeset/20466-gantt-timezone-describe.md b/.changeset/20466-gantt-timezone-describe.md
new file mode 100644
index 00000000000..1f7b76ce074
--- /dev/null
+++ b/.changeset/20466-gantt-timezone-describe.md
@@ -0,0 +1,20 @@
+---
+"@objectstack/spec": patch
+---
+
+fix(spec): correct `GanttConfig.timeZone`'s describe — persisted gantt drops on a `date` field are not "real instants" (#20466)
+
+Clause-②: no
+
+The `GanttConfig` `timeZone` member's `.describe()` said "persisted data stays real
+instants" for every field. That is false for a `Field.date` column: per the spec's own
+storage rule (`temporalStorageForm` / ADR-0053), a gantt drop on a `date` field writes the
+calendar day it landed on, as a timezone-naive `YYYY-MM-DD`, while a `datetime` field
+still writes the real instant. Only the false clause is replaced — "a datetime value is
+still written as the real instant, and a date value as the calendar day it was dropped on
+in this zone's calendar (`YYYY-MM-DD`)" — the rest of the describe, and every other
+member, is unchanged.
+
+No key moves and no verdict moves: this corrects a published describe's prose to match
+the contract it already had, it does not add, remove or re-scope anything authorable. The
+JSON Schema and reference docs regenerate from the corrected source.
diff --git a/content/docs/references/ui/component.mdx b/content/docs/references/ui/component.mdx
index 930d64f9d7a..fa285bc05d5 100644
--- a/content/docs/references/ui/component.mdx
+++ b/content/docs/references/ui/component.mdx
@@ -676,7 +676,7 @@ Sort field and direction pair
 | **summaryExtent** | `Enum<'children' \| 'self'>` | optional | How a summary bar's span is computed. 'children' (renderer default) rolls the bar up from its children — min start, max end, duration-weighted progress — and ignores the record's own dates; 'self' renders the record's OWN start, end and progress and falls back to rollup only for records without dates (use it when the parent's schedule is authoritative, e.g. a shift plan whose work-order children are locked history) |
 | **defaultCollapsedDepth** | `integer` | optional | Auto-collapse tree nodes at or below this 0-indexed depth on first render (roots are depth 0): every node at that depth or deeper that has children starts folded; the user can still expand them. Omit to start fully expanded |
 | **dependencyTypes** | `boolean` | optional | Whether the backing store persists dependency link TYPES (fs, ss, ff, sf); renderer default true. Set false when dependencies are bare predecessor ids: the link menu hides the type switcher (a switch would be silently reverted on refetch) and drag-created links are always finish-to-start |
-| **timeZone** | `string` | optional | Business time zone, an IANA name such as 'Asia/Shanghai': the chart's calendar — shift bands, day columns, snapping, the today line, date labels — renders in this zone's wall time for every viewer instead of the browser's zone; persisted data stays real instants. An invalid name falls back to the browser zone with a console warning |
+| **timeZone** | `string` | optional | Business time zone, an IANA name such as 'Asia/Shanghai': the chart's calendar — shift bands, day columns, snapping, the today line, date labels — renders in this zone's wall time for every viewer instead of the browser's zone; a datetime value is still written as the real instant, and a date value as the calendar day it was dropped on in this zone's calendar (YYYY-MM-DD). An invalid name falls back to the browser zone with a console warning |
 | **exportFileName** | `string` | optional | Base name for exported PNG and PDF files (e.g. the view's display label — the host's view schema often reaches the renderer stripped of label); falls back to the object schema label, then the object API name. A timestamp suffix is always appended |
 | **interactions** | `{ move?: boolean; resize?: boolean; progress?: boolean; link?: boolean }` | optional | Per-interaction switches, each defaulting to true: allow bar moves but pin durations (resize: false), or keep the dependency UI read-only (link: false). They only narrow what readOnly and row locks already allow |
 | **timeSegments** | `{ dayStart?: string; bands: object[]; showMidnight?: boolean }` | optional | Shift segmentation for the day-mode timeline: splits each shift-day (starting at dayStart) into the configured bands — a two-tier header (date over band), per-band tints and drag/resize snapping to band boundaries. No shift concept is hardcoded; bands are pure config. Off when omitted |
diff --git a/content/docs/references/ui/view.mdx b/content/docs/references/ui/view.mdx
index 2502f806f71..9ab5a12f935 100644
--- a/content/docs/references/ui/view.mdx
+++ b/content/docs/references/ui/view.mdx
@@ -581,7 +581,7 @@ Gallery/card view configuration
 | **summaryExtent** | `Enum<'children' \| 'self'>` | optional | How a summary bar's span is computed. 'children' (renderer default) rolls the bar up from its children — min start, max end, duration-weighted progress — and ignores the record's own dates; 'self' renders the record's OWN start, end and progress and falls back to rollup only for records without dates (use it when the parent's schedule is authoritative, e.g. a shift plan whose work-order children are locked history) |
 | **defaultCollapsedDepth** | `integer` | optional | Auto-collapse tree nodes at or below this 0-indexed depth on first render (roots are depth 0): every node at that depth or deeper that has children starts folded; the user can still expand them. Omit to start fully expanded |
 | **dependencyTypes** | `boolean` | optional | Whether the backing store persists dependency link TYPES (fs, ss, ff, sf); renderer default true. Set false when dependencies are bare predecessor ids: the link menu hides the type switcher (a switch would be silently reverted on refetch) and drag-created links are always finish-to-start |
-| **timeZone** | `string` | optional | Business time zone, an IANA name such as 'Asia/Shanghai': the chart's calendar — shift bands, day columns, snapping, the today line, date labels — renders in this zone's wall time for every viewer instead of the browser's zone; persisted data stays real instants. An invalid name falls back to the browser zone with a console warning |
+| **timeZone** | `string` | optional | Business time zone, an IANA name such as 'Asia/Shanghai': the chart's calendar — shift bands, day columns, snapping, the today line, date labels — renders in this zone's wall time for every viewer instead of the browser's zone; a datetime value is still written as the real instant, and a date value as the calendar day it was dropped on in this zone's calendar (YYYY-MM-DD). An invalid name falls back to the browser zone with a console warning |
 | **exportFileName** | `string` | optional | Base name for exported PNG and PDF files (e.g. the view's display label — the host's view schema often reaches the renderer stripped of label); falls back to the object schema label, then the object API name. A timestamp suffix is always appended |
 | **interactions** | `{ move?: boolean; resize?: boolean; progress?: boolean; link?: boolean }` | optional | Per-interaction switches, each defaulting to true: allow bar moves but pin durations (resize: false), or keep the dependency UI read-only (link: false). They only narrow what readOnly and row locks already allow |
 | **timeSegments** | `{ dayStart?: string; bands: object[]; showMidnight?: boolean }` | optional | Shift segmentation for the day-mode timeline: splits each shift-day (starting at dayStart) into the configured bands — a two-tier header (date over band), per-band tints and drag/resize snapping to band boundaries. No shift concept is hardcoded; bands are pure config. Off when omitted |
@@ -979,7 +979,7 @@ View filter rule
 | **summaryExtent** | `Enum<'children' \| 'self'>` | optional | How a summary bar's span is computed. 'children' (renderer default) rolls the bar up from its children — min start, max end, duration-weighted progress — and ignores the record's own dates; 'self' renders the record's OWN start, end and progress and falls back to rollup only for records without dates (use it when the parent's schedule is authoritative, e.g. a shift plan whose work-order children are locked history) |
 | **defaultCollapsedDepth** | `integer` | optional | Auto-collapse tree nodes at or below this 0-indexed depth on first render (roots are depth 0): every node at that depth or deeper that has children starts folded; the user can still expand them. Omit to start fully expanded |
 | **dependencyTypes** | `boolean` | optional | Whether the backing store persists dependency link TYPES (fs, ss, ff, sf); renderer default true. Set false when dependencies are bare predecessor ids: the link menu hides the type switcher (a switch would be silently reverted on refetch) and drag-created links are always finish-to-start |
-| **timeZone** | `string` | optional | Business time zone, an IANA name such as 'Asia/Shanghai': the chart's calendar — shift bands, day columns, snapping, the today line, date labels — renders in this zone's wall time for every viewer instead of the browser's zone; persisted data stays real instants. An invalid name falls back to the browser zone with a console warning |
+| **timeZone** | `string` | optional | Business time zone, an IANA name such as 'Asia/Shanghai': the chart's calendar — shift bands, day columns, snapping, the today line, date labels — renders in this zone's wall time for every viewer instead of the browser's zone; a datetime value is still written as the real instant, and a date value as the calendar day it was dropped on in this zone's calendar (YYYY-MM-DD). An invalid name falls back to the browser zone with a console warning |
 | **exportFileName** | `string` | optional | Base name for exported PNG and PDF files (e.g. the view's display label — the host's view schema often reaches the renderer stripped of label); falls back to the object schema label, then the object API name. A timestamp suffix is always appended |
 | **interactions** | `{ move?: boolean; resize?: boolean; progress?: boolean; link?: boolean }` | optional | Per-interaction switches, each defaulting to true: allow bar moves but pin durations (resize: false), or keep the dependency UI read-only (link: false). They only narrow what readOnly and row locks already allow |
 | **timeSegments** | `{ dayStart?: string; bands: object[]; showMidnight?: boolean }` | optional | Shift segmentation for the day-mode timeline: splits each shift-day (starting at dayStart) into the configured bands — a two-tier header (date over band), per-band tints and drag/resize snapping to band boundaries. No shift concept is hardcoded; bands are pure config. Off when omitted |
@@ -1362,7 +1362,7 @@ View filter rule
 | **summaryExtent** | `Enum<'children' \| 'self'>` | optional | How a summary bar's span is computed. 'children' (renderer default) rolls the bar up from its children — min start, max end, duration-weighted progress — and ignores the record's own dates; 'self' renders the record's OWN start, end and progress and falls back to rollup only for records without dates (use it when the parent's schedule is authoritative, e.g. a shift plan whose work-order children are locked history) |
 | **defaultCollapsedDepth** | `integer` | optional | Auto-collapse tree nodes at or below this 0-indexed depth on first render (roots are depth 0): every node at that depth or deeper that has children starts folded; the user can still expand them. Omit to start fully expanded |
 | **dependencyTypes** | `boolean` | optional | Whether the backing store persists dependency link TYPES (fs, ss, ff, sf); renderer default true. Set false when dependencies are bare predecessor ids: the link menu hides the type switcher (a switch would be silently reverted on refetch) and drag-created links are always finish-to-start |
-| **timeZone** | `string` | optional | Business time zone, an IANA name such as 'Asia/Shanghai': the chart's calendar — shift bands, day columns, snapping, the today line, date labels — renders in this zone's wall time for every viewer instead of the browser's zone; persisted data stays real instants. An invalid name falls back to the browser zone with a console warning |
+| **timeZone** | `string` | optional | Business time zone, an IANA name such as 'Asia/Shanghai': the chart's calendar — shift bands, day columns, snapping, the today line, date labels — renders in this zone's wall time for every viewer instead of the browser's zone; a datetime value is still written as the real instant, and a date value as the calendar day it was dropped on in this zone's calendar (YYYY-MM-DD). An invalid name falls back to the browser zone with a console warning |
 | **exportFileName** | `string` | optional | Base name for exported PNG and PDF files (e.g. the view's display label — the host's view schema often reaches the renderer stripped of label); falls back to the object schema label, then the object API name. A timestamp suffix is always appended |
 | **interactions** | `{ move?: boolean; resize?: boolean; progress?: boolean; link?: boolean }` | optional | Per-interaction switches, each defaulting to true: allow bar moves but pin durations (resize: false), or keep the dependency UI read-only (link: false). They only narrow what readOnly and row locks already allow |
 | **timeSegments** | `{ dayStart?: string; bands: object[]; showMidnight?: boolean }` | optional | Shift segmentation for the day-mode timeline: splits each shift-day (starting at dayStart) into the configured bands — a two-tier header (date over band), per-band tints and drag/resize snapping to band boundaries. No shift concept is hardcoded; bands are pure config. Off when omitted |
diff --git a/packages/spec/src/ui/view.zod.ts b/packages/spec/src/ui/view.zod.ts
index 77fbb237199..c2a6b90ac89 100644
--- a/packages/spec/src/ui/view.zod.ts
+++ b/packages/spec/src/ui/view.zod.ts
@@ -1917,7 +1917,7 @@ export const GanttConfigSchema = lazySchema(() => strictObject({
   summaryExtent: z.enum(['children', 'self']).optional().describe("How a summary bar's span is computed. 'children' (renderer default) rolls the bar up from its children — min start, max end, duration-weighted progress — and ignores the record's own dates; 'self' renders the record's OWN start, end and progress and falls back to rollup only for records without dates (use it when the parent's schedule is authoritative, e.g. a shift plan whose work-order children are locked history)"),
   defaultCollapsedDepth: z.number().int().min(0).optional().describe('Auto-collapse tree nodes at or below this 0-indexed depth on first render (roots are depth 0): every node at that depth or deeper that has children starts folded; the user can still expand them. Omit to start fully expanded'),
   dependencyTypes: z.boolean().optional().describe('Whether the backing store persists dependency link TYPES (fs, ss, ff, sf); renderer default true. Set false when dependencies are bare predecessor ids: the link menu hides the type switcher (a switch would be silently reverted on refetch) and drag-created links are always finish-to-start'),
-  timeZone: z.string().optional().describe("Business time zone, an IANA name such as 'Asia/Shanghai': the chart's calendar — shift bands, day columns, snapping, the today line, date labels — renders in this zone's wall time for every viewer instead of the browser's zone; persisted data stays real instants. An invalid name falls back to the browser zone with a console warning"),
+  timeZone: z.string().optional().describe("Business time zone, an IANA name such as 'Asia/Shanghai': the chart's calendar — shift bands, day columns, snapping, the today line, date labels — renders in this zone's wall time for every viewer instead of the browser's zone; a datetime value is still written as the real instant, and a date value as the calendar day it was dropped on in this zone's calendar (YYYY-MM-DD). An invalid name falls back to the browser zone with a console warning"),
   exportFileName: z.string().optional().describe("Base name for exported PNG and PDF files (e.g. the view's display label — the host's view schema often reaches the renderer stripped of label); falls back to the object schema label, then the object API name. A timestamp suffix is always appended"),
   interactions: strictObject({
     surface: 'this gantt interactions block',