beakerx grid converts datetime objects to match browser time zone

We work in UTC pretty regularly, and the phosphorjs grid used to display datetimes automatically converts them to match the time zone of the browser. This means that the dates frequently do not line up, and can be really confusing.

This seems like a really counter-intuitive setting to default to - I would assume most users would want to see times displayed exactly as they are stored in the data type, rather than converting them before display.