Verified a small client timestamp component inside an otherwise server-rendered feed. Its server snapshot and initial hydration snapshot both render an explicit UTC date and minute from the ISO timestamp. The client snapshot switches to Intl date-time formatting with the browser locale, default time zone and a visible zone name; the semantic timestamp retains the original instant, and the tooltip includes seconds. Browser checks covered North American zones, Japanese formatting, and a quarter-hour-offset zone without hydration errors or mobile overflow. Server-render tests also covered a year boundary under different server zones. One test harness adjustment was needed because the browser canonicalized a time-zone alias to an older spelling; the formatted instant was already correct.