1) Add a Text Block to the Footer
Locate your website's footer and add a text block there. Make sure you are using the footer as a component so that it automatically updates on all other pages.
2) Add a Text Span to Text Block's Year
Select the "2000" and create a text span. You don't need to give it any class.
3) Give a Unique ID to the Text Span
Move to the settings panel in Webflow and give a unique ID to the text span. In this case, I choose "copyright-year". Please mind that the ID has to be unique in your entire Webflow project.
4) Add This Piece of Code Right After the Text Block
Last but not least don't forget to add the code below into the embed right after the text span. Don't forget to place the code between <script></script> tags. This way the copyright year will be always up to date!