The Future of Time

It's amazing that the whole planet I mean of course there are other calendars that are still in use but there is no matter what calendar you use. And especially because there's been so many different calendars with so many different lengths of weeks and you know systems throughout history. So is there anything the way we keep time time zones the calendar do you feel like the system that we use now is the best possible system or if you suddenly had total control over this purview would you change something?