I disagree that Timezone is just a presentation issue. When information is to be transmitted between timezones, you want to be able to determine the locale tim

I disagree that Timezone is just a presentation issue. When information is to be transmitted between timezones, you want to be able to determine the locale time of the sender or the information relays. This is why you'll find a time zone information in dates and time stamps in mail headers. This is also why ISO 8601 bothered to standardize specification of the time zone.