From the old menu

World clock

The drop-down clock used to live in the cyan menu frame next to a rotting “This Day in History” widget. The history widget is gone. The clock is client-side only — your device’s clock, plus a zone offset. It is not an official time signal.

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Offsets are whole hours from UTC as on the original menu. They do not track daylight-saving changes. For official time use time.gov.