1. Go to Control Panel and double click onRegional and Language Options.
2. Click on Customize and go to Time tab.
3. To put your name, just click on the scroll down text and rename it with anything you want. Like you see in the above image, I put “Cypher” beside the AM and PM.
4. Finally, click Ok and Ok to accept the changes.
Just incase you want to get back to the original setting, just pick the AM and PM from the drop down list. Using Windows Vista? Don’t worry, this trick is also works in Windows Vista.
Warning: This does not only effect the clock at the taskbar but it is also changes the whole clock system. Press F5 in notepad to confirm.