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apps/web/src/locale.ts

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+export const UI_LOCALE = 'nl-BE';
+export const UI_TIME_ZONE = 'Europe/Brussels';
+
+const numberFormatter = new Intl.NumberFormat(UI_LOCALE);
+const decimalFormatter = new Intl.NumberFormat(UI_LOCALE, { maximumFractionDigits: 1 });
+const dateTimeFormatter = new Intl.DateTimeFormat(UI_LOCALE, { dateStyle: 'medium', timeStyle: 'short', timeZone: UI_TIME_ZONE });
+export const NEVER_RECEIVED = 'Nooit ontvangen';
+
+export function formatNumber(value: number, maximumFractionDigits?: number): string {
+  if (!Number.isFinite(value)) return '—';
+  return (maximumFractionDigits === undefined ? numberFormatter : new Intl.NumberFormat(UI_LOCALE, { maximumFractionDigits })).format(value);
+}
+
+export function formatDecimal(value: number): string {
+  return Number.isFinite(value) ? decimalFormatter.format(value) : '—';
+}
+
+export function formatDateTime(value?: string): string {
+  if (!hasReceivedTimestamp(value)) return NEVER_RECEIVED;
+  const date = new Date(value);
+  return dateTimeFormatter.format(date);
+}
+
+/** Rejects transport zero-values and invalid input before they reach a visible <time>. */
+export function hasReceivedTimestamp(value?: string): value is string {
+  if (!value?.trim()) return false;
+  const date = new Date(value);
+  return Number.isFinite(date.valueOf()) && date.valueOf() > 0 && date.getUTCFullYear() > 1;
+}
+
+export function formatPercent(value?: number, maximumFractionDigits = 1): string {
+  return value === undefined || !Number.isFinite(value) ? '—' : new Intl.NumberFormat(UI_LOCALE, { maximumFractionDigits, style: 'percent' }).format(value / 100);
+}