The Roman Calendar is obviously a form of date-based content. Other kinds of rotating content can be either calendar-based or random. In other words, you can use exactly the same content to create a date-based script and a random script.

For example, I have created some collections of Latin proverbs and created two different types of scripts based on the same set of proverbs. There is a "Latin Proverb of the Day" (date-based content), as well as a "Random Latin Proverb" which is based on that same content.

When you reload the webpage, the random content changes each time - but the date-based content will stay the same. Here are the two different Latin proverb scripts side by side, so that you can compare the way that the two scripts display.