the year dot | the year one
Meaning: You can say "the year dot", or "the year one", when you're talking about a very, very long time ago.
- There have been people living in Australia since the year dot, but Europeans have only been there for about two hundred years.
- People have been interested in the stars and the moon since the year one.
People have been living in the Nile valley since the year dot. They've been there