diff --git a/agents/drivers/duckdb/Cargo.lock b/agents/drivers/duckdb/Cargo.lock
index 54376b084e..6b6600204b 100644
--- a/agents/drivers/duckdb/Cargo.lock
+++ b/agents/drivers/duckdb/Cargo.lock
@@ -1252,7 +1252,6 @@ dependencies = [
  "fs2",
  "futures",
  "httpdate",
- "iana-time-zone",
  "insta",
  "json5",
  "jsonwebtoken",
diff --git a/apps/desktop/src/components/grid/TemporalCellEditor.vue b/apps/desktop/src/components/grid/TemporalCellEditor.vue
index 91d044a04b..d0cdbcb91c 100644
--- a/apps/desktop/src/components/grid/TemporalCellEditor.vue
+++ b/apps/desktop/src/components/grid/TemporalCellEditor.vue
@@ -4,7 +4,7 @@ import type { FocusOutsideEvent, PointerDownOutsideEvent } from "reka-ui";
 import { CalendarClock, ChevronDown, ChevronUp, CircleSlash } from "@lucide/vue";
 import { Button } from "@/components/ui/button";
 import { Popover, PopoverAnchor, PopoverContent, PopoverTrigger } from "@/components/ui/popover";
-import { formatTemporalInputValue, parseTemporalInputValue, stepTemporalInputValue, temporalOffsetSuffix, type TemporalCellEditorKind } from "@/lib/dataGrid/dataGridTemporalEditor";
+import { formatTemporalInputValue, hostTimezoneOffsetSuffix, parseTemporalInputValue, stepTemporalInputValue, temporalOffsetSuffix, type TemporalCellEditorKind } from "@/lib/dataGrid/dataGridTemporalEditor";
 
 const props = withDefaults(
   defineProps<{
@@ -192,9 +192,12 @@ function setNow() {
   const now = new Date();
   const dateText = [String(now.getFullYear()).padStart(4, "0"), String(now.getMonth() + 1).padStart(2, "0"), String(now.getDate()).padStart(2, "0")].join("-");
   const nextTime = [String(now.getHours()).padStart(2, "0"), String(now.getMinutes()).padStart(2, "0"), String(now.getSeconds()).padStart(2, "0")].join(":") + nowFractionSuffix(now);
+  // tz-aware columns must carry an explicit offset, otherwise the server parses
+  // the host wall clock in its own session timezone
+  const offsetSuffix = temporalOffsetSuffix(localValue.value, props.kind) ? hostTimezoneOffsetSuffix(now) : "";
   if (props.kind === "date") setModelValue(dateText, true);
-  else if (props.kind === "time") setModelValue(nextTime, true);
-  else setModelValue(`${dateText} ${nextTime}`, true);
+  else if (props.kind === "time") setModelValue(`${nextTime}${offsetSuffix}`, true);
+  else setModelValue(`${dateText} ${nextTime}${offsetSuffix}`, true);
 }
 
 function finishCommit() {
diff --git a/apps/desktop/src/lib/__tests__/dataGrid/dataGridTemporalEditor.spec.ts b/apps/desktop/src/lib/__tests__/dataGrid/dataGridTemporalEditor.spec.ts
index 7bc3245387..86fb1544f3 100644
--- a/apps/desktop/src/lib/__tests__/dataGrid/dataGridTemporalEditor.spec.ts
+++ b/apps/desktop/src/lib/__tests__/dataGrid/dataGridTemporalEditor.spec.ts
@@ -1,5 +1,5 @@
-import { describe, expect, it } from "vitest";
-import { formatTemporalInputValue, parseTemporalInputValue, stepTemporalInputValue, temporalCellEditorConfig, temporalCellEditorKind } from "@/lib/dataGrid/dataGridTemporalEditor";
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { formatTemporalInputValue, hostTimezoneOffsetSuffix, parseTemporalInputValue, stepTemporalInputValue, temporalCellEditorConfig, temporalCellEditorKind } from "@/lib/dataGrid/dataGridTemporalEditor";
 
 describe("dataGridTemporalEditor", () => {
   it("resolves temporal editor configs with fractional precision", () => {
@@ -54,4 +54,26 @@ describe("dataGridTemporalEditor", () => {
     expect(formatTemporalInputValue("2026-07-09 12:34:56", "datetime")).toBe("2026-07-09T12:34:56");
     expect(parseTemporalInputValue("2026-07-09T12:34:56", "datetime")).toBe("2026-07-09 12:34:56");
   });
+
+  it("formats the host timezone offset for tz-aware Now values", () => {
+    const now = new Date("2026-09-13T12:00:00Z");
+    const spy = vi.spyOn(Date.prototype, "getTimezoneOffset");
+
+    try {
+      spy.mockReturnValue(-480);
+      expect(hostTimezoneOffsetSuffix(now)).toBe("+08:00");
+
+      spy.mockReturnValue(330);
+      expect(hostTimezoneOffsetSuffix(now)).toBe("-05:30");
+
+      spy.mockReturnValue(0);
+      expect(hostTimezoneOffsetSuffix(now)).toBe("+00:00");
+    } finally {
+      spy.mockRestore();
+    }
+  });
+
+  afterEach(() => {
+    vi.restoreAllMocks();
+  });
 });
diff --git a/apps/desktop/src/lib/dataGrid/dataGridTemporalEditor.ts b/apps/desktop/src/lib/dataGrid/dataGridTemporalEditor.ts
index 2c7199ec2e..ec7c7bc283 100644
--- a/apps/desktop/src/lib/dataGrid/dataGridTemporalEditor.ts
+++ b/apps/desktop/src/lib/dataGrid/dataGridTemporalEditor.ts
@@ -78,6 +78,13 @@ export function temporalOffsetSuffix(value: string, kind: TemporalCellEditorKind
   return basePattern.test(withoutOffset) ? offset : "";
 }
 
+export function hostTimezoneOffsetSuffix(now: Date): string {
+  const minutes = -now.getTimezoneOffset();
+  const sign = minutes >= 0 ? "+" : "-";
+  const abs = Math.abs(minutes);
+  return `${sign}${String(Math.floor(abs / 60)).padStart(2, "0")}:${String(abs % 60).padStart(2, "0")}`;
+}
+
 export function stepTemporalInputValue(value: string, kind: TemporalCellEditorKind, part: TemporalCellEditorPart, delta: number): string {
   const dateParts = temporalDateParts(value);
   const timeParts = temporalTimeParts(value, kind);