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fix(web): show recent session times in local timezone #228

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fix(web): show recent session times in local timezone #228

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28 changes: 24 additions & 4 deletions frontend/src/pages/Home.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -17,13 +17,33 @@ interface RecentSession extends ChatSessionItem {
kbIndex: number
}

function formatWhen(iso: string): string {
/**
* Format a session timestamp for the recent-sessions cards.
*
* Backend stores UTC (`…Z`, see `openkb.agent.chat_session._utcnow_iso`).
* Never strip the `Z` and print the digits as-is — that shows UTC wall-clock
* and looks ~8h behind in China (UTC+8). Parse as an absolute Instant and
* format in the browser's local timezone; use the UI language only for the
* locale (digit/order style), not to hard-code a geographic zone.
*/
function formatWhen(iso: string, locale: string): string {
if (!iso) return ""
return iso.replace("T", " ").replace("Z", "").slice(0, 16)
const d = new Date(iso)
if (Number.isNaN(d.getTime())) return iso
// zh → zh-CN (Asia-friendly date order); en → en-US. Timezone = local.
const loc = locale.toLowerCase().startsWith("zh") ? "zh-CN" : locale || undefined
return d.toLocaleString(loc, {
year: "numeric",
month: "2-digit",
day: "2-digit",
hour: "2-digit",
minute: "2-digit",
hour12: false,
})
}

export default function Home() {
const { t } = useTranslation("home")
const { t, i18n } = useTranslation("home")
const navigate = useNavigate()
const location = useLocation() as { state?: { kbId?: string } }
const [kbs, setKbs] = useState<KbSummary[]>([])
Expand Down Expand Up @@ -116,7 +136,7 @@ export default function Home() {
{s.updated_at && (
<>
<span className="opacity-50">·</span>
{formatWhen(s.updated_at)}
{formatWhen(s.updated_at, i18n.language)}
</>
)}
<ArrowRight className="w-3.5 h-3.5 ml-auto opacity-0 -translate-x-1 group-hover:opacity-100 group-hover:translate-x-0 transition-all text-accent-brand" />
Expand Down