Interesting time standards

I’ve recently been interested in time standards like the local time e.g. Pacific Daylight Time and general times. And I saw a comment somewhere either on reddit or hacker news about how times would work in places not on Earth, like the moon. I came across Barycentric Coordinate Time which is a time standard that is intended to be used for outerspace objects like planets, moons, their orbits, and satellites launched from earth.

Of course, it’s pretty amazing that we’ve been using a calendar system created almost 500 years ago and it still seems to hold up.