HUGO

Zero maintenance Copyright © with current year

Minimalist and zero maintenance tip …

Drop this into your footer partial layout and you’ll never have to update the year - thanks to Hugo, the year is always right

Just be sure to have author in your config file

Copyright © {{ dateFormat "2006" now }} {{ .Site.Params.author }}.

Results in …

Copyright © 2020 Your Name

The general rule is that the year to include in a copyright notice is the year of first publication of the work. see https://www.copyrightlaws.com/copyright-symbol-notice-year/

And a quick google shows there are way too many opposing opinions to have one rule.

Quora
StackExchange

Some of it is personal style and choice - on my own site … I have

Copyright © Year I started Blogging - Current Year

1 Like

For constantly evolving websites and blogs that contain works published over several years, the notice may include a range of years (e.g., 2011–2020), starting from the date of the oldest published elements and ending with the date of the newest published elements.