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Implemented on develop in PR #25 (40d8dbc, cb01aa3), verified at e6e9daf on 2026-10-16. LocalTimestamp renders UTC during SSR/hydration and then the viewer's browser timezone, with zone labels. Calendar-date aggregates retain explicitly labelled UTC boundaries rather than shifting already-aggregated days. Date unit tests and timezone browser tests were added.
Render timestamps in the viewer's local timezone on the Economy Explorer.
Grounded: date/time formatting lives in economy-explorer/lib/format.ts (also used by Pagination, Footer, ActivityCalendar, charts). Because pages are SSR, timestamps currently format on the server (its tz/UTC), so a player abroad sees the wrong wall-clock time.
Make formatting timezone-aware: detect the viewer's tz (Intl resolved options client-side, or a tz cookie set on first load) and format against it — either hydrate the formatted strings client-side or pass the tz into the SSR formatter. Keep chart day-bucketing consistent with the chosen tz.