System Clock Missing Day Of Week

A friend of mine told me the other day that he had downloaded a third party system clock because his did not show the day of the week in the tool tip that appears when you hover over the time. He said the rest of the computers in his house did and that they were all running XP. At first I didn't think that this was even a feature of XP. My computer also does not do this. Today at work however, I just so happened to hover over the time and noticed that the tool tip did contain the day of the week. I am always double clicking the clock to check the day of the week at home and this feature would be quite useful.What's going on here? How do you get the day of the week to appear? I checked the system clock settings and there is nothing in there. Google's no help either.