Here’s an easy way to include the date in your system tray on your task bar. Download this small, free utility: http://www.rcis.co.za/dale/tclockex/.
Windows only shows the time in the tray. Although you can hover your mouse over the time to get the date, some might prefer it permanently attached.
This application requires little resources, so your system still runs fast. You can customize it to display a simple date + time, or change the font and go wild with colors. Very configurable. Very easy.