If you look from perspective of software creator that wants to handle all kind of timezones or post codes - yes humans complicate things. If you look from a pe

If you look from perspective of software creator that wants to handle all kind of timezones or post codes - yes humans complicate things. If you look from a person or user perspective - time zones or date formats are used in one location or in some context. People living in that context have it a lot easier because most of the time they don't care about other time zones. I would say people simplify things but on local scale. If you want to go global that is your problem not humans that live in one place and use single time zone all their life.