It is a vastly improved replacement for the standard Windows tray clock. It provides all the benefits of the original as well as many enhancements and a number of useful additional features. It achieves this with a tiny footprint and doesn't even require installation. Given the tiny size, the power of this program is most impressive. Less impressive is the help file which is brief and not particularly helpful. However the program is so well laid-out and simple to use that it's not really an issue. You might get a warning from your security software that TClock is potential spyware. It's not. It's just picking up the fact that it modifies explorer.exe to display the clock. The 2nd link below is to the Japanese author's site. You'll see some strange characters displayed but the "download" (sic) link is clear enough.