TClock is a program that enables you to modify the taskbar clock as well as the icon or letters on the start-button. TClock allows you to modify the clock on the taskbar and the icon and letters on the start-button. An alarm clock, a timer and a customization tool. TClock runs in your taskbar, it's free an easy to use.
TClock is a very small and portable application that can be used to get the Windows 7 look a like date and time format in Windows XP and Vista. It customizes the system tray clock to show not only the time but date and time both that too in various other formats as well.
The license of this software is Freeware, you can free download and free use this digital clock & timer software.