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Source: https://writers.stackexchange.com/q/7394
License name: CC BY-SA 3.0
License URL: https://creativecommons.org/licenses/by-sa/3.0/

So I want to write a Sci-Fi where humans have spread across the solar system and into the galaxy. There are multiple stories going across at several different times. E.g.:

1. Aliens attack Pluto
2. 3 weeks later, aliens arrive at Mars
3. Flashback scene to a few years ago, when Earthlings missed sign of invasion, leading to destruction of Earth.

Currently, I'm using Earth dates, something like: July 28 (Earth date), aliens attack Pluto, August 20 move to Mars etc. But people on Pluto wouldn't use the Earth calendar; they would use their own system. When those people talk about dates, what should they say? How can I convey to my _readers_ the dates of these various events (and the relationships among them) when the calendar systems used by the _characters_ would be different?

PS: I don't want something confusing like the Stardate system. I don't want to be explaining to my reader how my calendar works.

Original score: 11