The simple answer is no. CSS is not a dynamc language and knows nothing about the page in which the CSS loads. However, there are a few things that can help you reach your goal

My initial response was not particularly helpful, but feasible. Working with SASS, you could set a variable that would store the copyright year, but this would result in a requirement to update this variable on an annual basis. The output of this variable would then need to be displayed using the concept of ‘CSS content’ via a pseudo-element. While not the best solution, depending on the situation, could provide a possible route.

After thinking on the concept a little more, a secondary solution surfaced. Knowing that Nic at Nlightened, as well as us here at Parallax, use Drupal for our CMS requirements, an opportunity to utilize Drupal's native processing language, PHP, is present to give our CSS a helping hand. Note that this can also be done with any CMS, not just Drupal.