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i just put “© Right now” in the footer. i bet it’s prolly enough.

I don’t have one at all

Legally, it actually doesn’t need to exist. Everything is full copyright by default. When you do have it, it’s supposed to be original year then a list of years in which significant changes happened. If multiple years are consecutive, then you range those.

On my site I have it from the date I created the site to the current date.