Aweful idea: do you want to plan a meeting at 16:00 with colleagues in the US? It is very hard to tell if this makes sense without timezones. Is this in their working day? Or the equivalent of midnight? Or something else? There are no timezones, so there is no way of telling without looking at some shady website how many hours you are shifted - which is basically the concept of timezones anyway, but shittier.