Did you consider the aspect, that in many countries the date would change during the day?
So in UTC-5 the day would end at 19:00 solar time. „Lets meet up for dinner on Thursday“ would become completely ambiguous, depending on the time. If you move dinner on Tuesday at 18:30 (23:30 UTC) to an hour later, it would be on Friday at 0:30 UTC.
Common types calendars would become quite useless, they would need to be different for each timezone. It doesn’t make sense to split the events of one solar day into multiple day-columns in a calendar.
The vast majority of people plan their life around solar days, they usually don’t have appointments planned that span over two calendar days.
So in UTC-5 the day would end at 19:00 solar time. „Lets meet up for dinner on Thursday“ would become completely ambiguous, depending on the time. If you move dinner on Tuesday at 18:30 (23:30 UTC) to an hour later, it would be on Friday at 0:30 UTC.
Common types calendars would become quite useless, they would need to be different for each timezone. It doesn’t make sense to split the events of one solar day into multiple day-columns in a calendar.
The vast majority of people plan their life around solar days, they usually don’t have appointments planned that span over two calendar days.