In windows vista, you will see the new version of system clock dialog box. The appearance of new version of system clock dialog box  is slightly improved. A deviantart user fediaFedia has created a mod by which you will set the same vista clock properties dialog box in windows XP.

If you are willing to get this package, then follow the steps below to download:

Above, was the preview of this mod, in that you have seen the vista clock properties dialog box in windows XP. If you want to give a try to this mod then you can download it from following link:

Get Vista Clock Properties for Windows XP

Copy and Paste the file in system32 and then check your date and Time properties if you get a WFP message just exit out of it.

If you want to transform your Windows XP into Windows Vista then you might want to read: Change Windows XP into Windows Vista without using Customization Packs