Code Muffin

This plugin allows you to use the shortcode [copyright], which inserts a copyright symbol, the site name (linking back to the homepage), and the year.
A span with the class “copyright” wraps this, and the year is dynamically updated.
This is ideally used in the footer of your website. If shortcodes don’t work in widget areas on your site, check the FAQs.

Copyright Shortcode

Use the shortcode [copyright] to insert the copyright symbol, the year, and your name. Ideal for the footer.

miniweblab

The easiest way displaying current year and copyright symbol and since year in your copyright footer text or wherever else you like on your site. 
Just use shortcodes [Y] for current year and [C] for copyright symbol after plugin activation.
If you need to display the current year, and have it always kept up to date, inserting this plugin’s [y] or [y] shortcode anywhere on your web site will do just that.
If you need to display an official Copyright notice, inserting this plugin’s [C] or [c] shortcode provides the official C with a circle around it (“©”) required legally in many countries to Copyright many forms of intellectual property.
Other shortcodes of this plugin: 
* Use [cy] or [CY] to display copyright symbol © and the current year together. 
* Use [cc] or [CC] to display copyright symbol © and the word “Copyright”. 
* Use [csy since=”2016″] to display the symbol of copyright, first year and current year (Assuming it is currently the year 2019 ex. © 2016-2019). 
* Use [ccsy since=”2016″] to display the symbol of copyright (©) and the word “Copyright”, first year and current year (Assuming it is currently the year 2019 ex. © Copyright 2016-2019).

Snappy Year Shortcode

The easiest way displaying current year, copyright symbol and since year with shortcode.

Copyright Shortcode vs Snappy Year Shortcode