If the modern Settings UI is broken (sometimes seen after feature updates), the classic Date and Time dialog still works.

• Press Win + R, type timedate.cpl and press Enter.

When the Settings UI is unavailable, Windows provides command‑line tools to set or inspect time zone entries.
Key commands:

• Check current time zone: tzutil /g
• List available time zones: tzutil /l
• Set a time zone: tzutil /s "Time Zone Name" (the Windows time zone string, e.g., "Pacific Standard Time").