[iggldiggl]

Another thing is that having the change of calendar date in the middle of your waking hours is rather annoying and potentially confusing, and everybody in the world not living near wherever the meridian ends up will be subjected to that. (Because in that case a single calendar date can refer either to solar date A in the afternoon/evening, or solar date B in the morning).

Like should public holidays e.g. start and end right in the middle of the solar day because that's when midnight UTC happens locally? Do you reintroduce time zones by the back door by defining a local start/end time for day-based events to align them back to the solar day?