Format date-only labels without timezone shift

Use formatDateOnlyLabel across dashboard tables to avoid calendar-day shifts when the API returns date-only strings. Updated ProposicoesTable, TaquigraficasTable and VotacoesTable to use the helper and added the import in VotacoesTable. Reworked formatDateOnlyLabel to detect YYYY-MM-DD via a regex and construct a local Date(year, month-1, day) so the displayed day isn't affected by timezone parsing; it still falls back to parsing full ISO-like values and returns invalid inputs unchanged. Added unit tests (filterUtils.test.ts) covering date-only values, ISO-like values, and invalid inputs.

Author: fmercurio

ui/src/components/dashboard/ProposicoesTable.tsx

@@ -375,7 +375,7 @@ export function ProposicoesTable({ limit = 10, parliamentarianId }: ProposicoesT
                 >
                   <TableCell className="text-sm text-muted-foreground">
                     {proposicao.dataApresentacao
-                      ? new Date(proposicao.dataApresentacao).toLocaleDateString('pt-BR')
+                      ? formatDateOnlyLabel(proposicao.dataApresentacao)
                       : '—'}
                   </TableCell>
                   <TableCell className="font-medium">

ui/src/components/dashboard/TaquigraficasTable.tsx

@@ -333,7 +333,7 @@ export function TaquigraficasTable({ limit = 20, parliamentarianId }: Taquigrafi
                     ].join(' ')}
                   >
                     <TableCell className="text-sm text-muted-foreground">
-                      {speech.date ? new Date(speech.date).toLocaleDateString('pt-BR') : '—'}
+                      {speech.date ? formatDateOnlyLabel(speech.date) : '—'}
                     </TableCell>
                     {/* <TableCell className="text-sm">{speech.session_number ?? '—'}</TableCell> */}
                     <TableCell className="text-sm">{speech.type ?? '—'}</TableCell>

ui/src/components/dashboard/VotacoesTable.tsx

@@ -4,6 +4,7 @@ import { listRollCallVotes, type RollCallVoteSortBy, type SortOrder } from '@/ap
 import { mapRollCallVoteOutToVotacao } from '@/api/mappers';
 import {
   buildFilterChips,
+  formatDateOnlyLabel,
   formatDateTimeLabel,
   toIsoOrUndefined,
   useDraftAppliedFilters,
@@ -316,7 +317,7 @@ export function VotacoesTable({ limit = 10, parliamentarianId }: VotacoesTablePr
                       {votacao.proposicao}
                     </TableCell>
                     <TableCell className="text-sm text-muted-foreground">
-                      {votacao.data ? new Date(votacao.data).toLocaleDateString('pt-BR') : '—'}
+                      {votacao.data ? formatDateOnlyLabel(votacao.data) : '—'}
                     </TableCell>
                     <TableCell>
                       <div className="flex items-center gap-2 whitespace-nowrap">

ui/src/components/dashboard/filterUtils.test.ts

@@ -0,0 +1,18 @@
+import { describe, expect, it } from 'vitest';
+
+import { formatDateOnlyLabel } from './filterUtils';
+
+describe('formatDateOnlyLabel', () => {
+  it('formats date-only API values without shifting the calendar day', () => {
+    expect(formatDateOnlyLabel('2026-05-25')).toBe('25/05/2026');
+    expect(formatDateOnlyLabel('2026-05-18')).toBe('18/05/2026');
+  });
+
+  it('uses the calendar date portion from ISO-like values', () => {
+    expect(formatDateOnlyLabel('2026-05-25T23:30:00Z')).toBe('25/05/2026');
+  });
+
+  it('returns invalid values unchanged', () => {
+    expect(formatDateOnlyLabel('not-a-date')).toBe('not-a-date');
+  });
+});

ui/src/components/dashboard/filterUtils.ts

@@ -1,5 +1,7 @@
 import { useState } from 'react';
 
+const DATE_ONLY_PATTERN = /^(\d{4})-(\d{2})-(\d{2})/;
+
 type StringFilterShape<T> = {
   [K in keyof T]: string;
 };
@@ -26,7 +28,25 @@ export function formatDateTimeLabel(value: string): string {
 
 export function formatDateOnlyLabel(value: string): string {
   if (!value) return '';
-  const date = new Date(`${value}T00:00:00`);
+
+  const dateOnlyMatch = DATE_ONLY_PATTERN.exec(value);
+  if (dateOnlyMatch) {
+    const [, year, month, day] = dateOnlyMatch;
+    const parsedYear = Number(year);
+    const parsedMonth = Number(month) - 1;
+    const parsedDay = Number(day);
+    const localDate = new Date(parsedYear, parsedMonth, parsedDay);
+
+    if (
+      localDate.getFullYear() === parsedYear &&
+      localDate.getMonth() === parsedMonth &&
+      localDate.getDate() === parsedDay
+    ) {
+      return localDate.toLocaleDateString('pt-BR');
+    }
+  }
+
+  const date = new Date(value);
   if (Number.isNaN(date.getTime())) return value;
   return date.toLocaleDateString('pt-BR');
 }