If you're always forgetting what date it is, or you just need a plain and functional screensaver, then Today Screensaver is your answer.
Today Screen Saver displays the current time or date in huge letters on your screen whenever it goes into screensaver mode. There are virtually no options other than that to change the background color and to make the screensaver alternately display either the date or the time. The time and date is taken from your system clock, so make sure it's correct before running Today Screensaver!
If you're looking for a functional, no-frills screensaver with some practical use, Today Screensaver is a timely option.