diff --git a/surfsense_backend/app/agents/new_chat/tools/google_calendar/update_event.py b/surfsense_backend/app/agents/new_chat/tools/google_calendar/update_event.py
index 4b57cf2e3..a114c84f4 100644
--- a/surfsense_backend/app/agents/new_chat/tools/google_calendar/update_event.py
+++ b/surfsense_backend/app/agents/new_chat/tools/google_calendar/update_event.py
@@ -14,6 +14,20 @@ from app.services.google_calendar import GoogleCalendarToolMetadataService
 logger = logging.getLogger(__name__)
 
 
+def _is_date_only(value: str) -> bool:
+    """Return True when *value* looks like a bare date (YYYY-MM-DD) with no time component."""
+    return len(value) <= 10 and "T" not in value
+
+
+def _build_time_body(value: str, context: dict[str, Any] | Any) -> dict[str, str]:
+    """Build a Google Calendar start/end body using ``date`` for all-day
+    events and ``dateTime`` for timed events."""
+    if _is_date_only(value):
+        return {"date": value}
+    tz = context.get("timezone", "UTC") if isinstance(context, dict) else "UTC"
+    return {"dateTime": value, "timeZone": tz}
+
+
 def create_update_calendar_event_tool(
     db_session: AsyncSession | None = None,
     search_space_id: int | None = None,
@@ -255,25 +269,13 @@ def create_update_calendar_event_tool(
             if final_new_summary is not None:
                 update_body["summary"] = final_new_summary
             if final_new_start_datetime is not None:
-                tz = (
-                    context.get("timezone", "UTC")
-                    if isinstance(context, dict)
-                    else "UTC"
+                update_body["start"] = _build_time_body(
+                    final_new_start_datetime, context
                 )
-                update_body["start"] = {
-                    "dateTime": final_new_start_datetime,
-                    "timeZone": tz,
-                }
             if final_new_end_datetime is not None:
-                tz = (
-                    context.get("timezone", "UTC")
-                    if isinstance(context, dict)
-                    else "UTC"
+                update_body["end"] = _build_time_body(
+                    final_new_end_datetime, context
                 )
-                update_body["end"] = {
-                    "dateTime": final_new_end_datetime,
-                    "timeZone": tz,
-                }
             if final_new_description is not None:
                 update_body["description"] = final_new_description
             if final_new_location is not None:
diff --git a/surfsense_backend/app/services/google_calendar/kb_sync_service.py b/surfsense_backend/app/services/google_calendar/kb_sync_service.py
index 59afa116e..3cda02b9b 100644
--- a/surfsense_backend/app/services/google_calendar/kb_sync_service.py
+++ b/surfsense_backend/app/services/google_calendar/kb_sync_service.py
@@ -209,8 +209,8 @@ class GoogleCalendarKBSyncService:
             )
 
             calendar_id = (document.document_metadata or {}).get(
-                "calendar_id", "primary"
-            )
+                "calendar_id"
+            ) or "primary"
             live_event = await loop.run_in_executor(
                 None,
                 lambda: (
diff --git a/surfsense_web/components/hitl-edit-panel/hitl-edit-panel.tsx b/surfsense_web/components/hitl-edit-panel/hitl-edit-panel.tsx
index 25e896842..e8bc1a6cd 100644
--- a/surfsense_web/components/hitl-edit-panel/hitl-edit-panel.tsx
+++ b/surfsense_web/components/hitl-edit-panel/hitl-edit-panel.tsx
@@ -185,7 +185,7 @@ function DateTimePickerField({
 				type="time"
 				value={time}
 				onChange={handleTimeChange}
-				className="w-[120px] text-sm shrink-0 pl-1.5 [&::-webkit-calendar-picker-indicator]:order-first [&::-webkit-calendar-picker-indicator]:mr-1"
+				className="w-[120px] text-sm shrink-0 appearance-none [&::-webkit-calendar-picker-indicator]:hidden [&::-webkit-calendar-picker-indicator]:appearance-none"
 			/>
 		</div>
 	);
diff --git a/surfsense_web/components/tool-ui/google-calendar/update-event.tsx b/surfsense_web/components/tool-ui/google-calendar/update-event.tsx
index cc941bab8..661032628 100644
--- a/surfsense_web/components/tool-ui/google-calendar/update-event.tsx
+++ b/surfsense_web/components/tool-ui/google-calendar/update-event.tsx
@@ -253,6 +253,12 @@ function ApprovalCard({
 		String(effectiveNewDescription ?? "") !== (event?.description ?? "");
 
 	const buildFinalArgs = useCallback(() => {
+		const base = {
+			event_id: event?.event_id,
+			document_id: event?.document_id,
+			connector_id: account?.id,
+		};
+
 		if (pendingEdits) {
 			const attendeesArr = pendingEdits.attendees
 				? pendingEdits.attendees
@@ -260,22 +266,38 @@ function ApprovalCard({
 						.map((e) => e.trim())
 						.filter(Boolean)
 				: null;
+			const origAttendees = event?.attendees?.map((a) => a.email) ?? [];
+
 			return {
-				event_id: event?.event_id,
-				document_id: event?.document_id,
-				connector_id: account?.id,
-				new_summary: pendingEdits.summary || null,
-				new_description: pendingEdits.description || null,
-				new_start_datetime: pendingEdits.start_datetime || null,
-				new_end_datetime: pendingEdits.end_datetime || null,
-				new_location: pendingEdits.location || null,
-				new_attendees: attendeesArr,
+				...base,
+				new_summary:
+					pendingEdits.summary && pendingEdits.summary !== (event?.summary ?? "")
+						? pendingEdits.summary
+						: null,
+				new_description:
+					pendingEdits.description !== (event?.description ?? "")
+						? pendingEdits.description || null
+						: null,
+				new_start_datetime:
+					pendingEdits.start_datetime && pendingEdits.start_datetime !== (event?.start ?? "")
+						? pendingEdits.start_datetime
+						: null,
+				new_end_datetime:
+					pendingEdits.end_datetime && pendingEdits.end_datetime !== (event?.end ?? "")
+						? pendingEdits.end_datetime
+						: null,
+				new_location:
+					pendingEdits.location !== (event?.location ?? "")
+						? pendingEdits.location || null
+						: null,
+				new_attendees:
+					attendeesArr && attendeesArr.join(",") !== origAttendees.join(",")
+						? attendeesArr
+						: null,
 			};
 		}
 		return {
-			event_id: event?.event_id,
-			document_id: event?.document_id,
-			connector_id: account?.id,
+			...base,
 			new_summary: actionArgs.new_summary ?? null,
 			new_description: actionArgs.new_description ?? null,
 			new_start_datetime: actionArgs.new_start_datetime ?? null,