Well surely it would be the same situation as currently? You still need to know the 'time' difference between Country A and Country B if you want to contact someone. The only thing that would change is that the clocks would say the same thing in both places

Like I said, I think it's much easier to memorize offsets which can be used to very quickly compute the actual time of day versus this other method. With our current system, I know my timezone, Pacific, is 7 hours behind Greenwich's Time Zone. If I want to figure out what time it is in Greenwich, I add 7 hours to mine. It's about 9:30 AM here, so it's about 4:30 PM over there. Boom. With the proposed system, which let's say is calibrated around the Pacific Time Zone for sake of egocentricness, I know that it's 9:30 AM here which is about mid morning. I know off the top of my head that Early Morning in Greenwich is probably around 11:00 PM Earth Time (In reality: 6:00 AM Greenwich Time), and the difference between then and now is about 10 hours... well if there are about 6 hours till noon, and four hours remaining, then that puts us in the Afternoon! YES! How much time till midnight their time? HOLD ON LET ME DO MORE A TON MORE MATH TO FIGURE OUT WHEN THAT IS! It's the difference between memorizing an offset and memorizing a schema. The latter is larger, so it makes sense to have one that is consistant for everyone (12:00 PM is noon, 12:00 AM is Midnight) and then memorize smaller offsets. The nice thing too is that you can use existing memorized offsets to estimate the timezone in countries that you don't know the time in. "Let's see, it's 4:30 in Greenwich, and France is what? One to three hours ahead? At worst, it's 7:30 PM there, at best, it's 5:30 PM, it should be safe to call my pen pal" Notice that if you try to adopt this sense of "When is morning" in Earth Time from Greenwich to France, what is the operation you are doing? "Well, France is one to three timezones ahead of Greenwich, so their morning happens one to three hours later than Britains... OH WAIT LOOKS LIKE I'M JUST USING OFFSETS WELL SHIT."