This is the issue where it really falls apart for me. As someone who regularly stays up until 2 or 3 or 5 am even now, I'm well aware of the careful phrasing t

This is the issue where it really falls apart for me. As someone who regularly stays up until 2 or 3 or 5 am even now, I'm well aware of the careful phrasing that is required if I send an email in the wee hours referring to upcoming events---"today" and "tomorrow" are to be avoided, or clarified. Probably most of the people here have had to be careful about this at some point. But, it's a reasonably constrained problem, as it currently stands; at least we don't generally have to deal with events that cross the date boundary. If that date transition happened in the middle of the bulk of daytime events, though....