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format.js

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+const dateTimeFmt = new Intl.DateTimeFormat(undefined, { dateStyle: 'medium', timeStyle: 'short' });
+const timeFmt = new Intl.DateTimeFormat(undefined, { timeStyle: 'medium' });
+const relFmt = new Intl.RelativeTimeFormat(undefined, { numeric: 'auto' });
+
+const REL_UNITS = [
+  ['year', 31_536_000], ['month', 2_592_000], ['week', 604_800],
+  ['day', 86_400], ['hour', 3_600], ['minute', 60],
+];
+
+export function parseDate(value) {
+  if (!value) return null;
+  const d = new Date(value);
+  return Number.isNaN(d.getTime()) ? null : d;
+}
+
+export const formatDateTime = (d) => (d ? dateTimeFmt.format(d) : '—');
+export const formatTime = (d) => timeFmt.format(d);
+
+export function formatRelative(d, now = Date.now()) {
+  if (!d) return '';
+  const diffSec = Math.round((d.getTime() - now) / 1000);
+  for (const [unit, secs] of REL_UNITS) {
+    if (Math.abs(diffSec) >= secs) return relFmt.format(Math.round(diffSec / secs), unit);
+  }
+  return relFmt.format(diffSec, 'second');
+}
+
+export function formatDuration(totalSec) {
+  if (totalSec == null || Number.isNaN(Number(totalSec))) return null;
+  const s = Math.max(0, Math.round(totalSec));
+  const h = Math.floor(s / 3600);
+  const m = Math.floor((s % 3600) / 60);
+  const sec = s % 60;
+  return [h && `${h}h`, (h || m) && `${m}m`, `${sec}s`].filter(Boolean).join(' ');
+}
+
+export function formatBytes(bytes) {
+  if (bytes == null || Number.isNaN(Number(bytes))) return null;
+  const units = ['B', 'KB', 'MB', 'GB', 'TB', 'PB'];
+  let n = Number(bytes);
+  let i = 0;
+  while (n >= 1024 && i < units.length - 1) { n /= 1024; i++; }
+  return `${n.toFixed(i === 0 ? 0 : 1)} ${units[i]}`;
+}