I think you want d3.utcFormat here, not d3.timeFormat; the latter uses local time. You can also access this field more directly using our internal API as the update_time field, but this is not supported and does not expose the necessary CORS header for access from a notebook. https://api.observablehq.com/document/@mootari/notebook-input@252 The correct answer in this case should 2021-07-05T12:40:28.790Z. The time being off by 28 minutes is surprising.

Thanks! I've replaced d3.timeFormat and added API helpers for both the internal API and the bundle method.

The time difference was caused by a wrong formatter ("%I" instead of "%M").