Re: [tz] The case against time zones

Note that for this to work, it would imply that the calendar and the day also has to be fixed in one timezone meaning that the transition between days will happen at different period of the local day, some switch at night, some in the middle of the day.

Exactly.  Time zones allow us to have a relevant meaning for "today", "wednesday", "next saturday", etc. My son learned the days of the week as sing-song in preschool.  I can imagine if we abolished time zones that it would go something like this: ♬ "There are seven-ish days, there are seven-ish days, there are seven-ish days in the week...   Sunday-Monday, Monday-Tuesday, Tuesday-Wednesday, Wednesday-Thursday, Thursday-Friday, Friday-Saturday, Saturday-Sunday..." ♬