Many a time, one can end up leaving a system running for a longer period of time than might be required. In fact, some people seldom turn off their computer, which results in straining system components (such as the battery) and the computer on the whole. When it comes to more professional requirements, servers are almost never shut down, except for perhaps maintenance windows and repair purposes. Either way, it becomes necessary to check the time a system’s uptime in order to calculate the load that the system is facing. For example, if a backup server is shut down on a periodic basis, while load is transferred to another server (as a rule), then it might be worth checking out if any of them are being run more than their designated time.
PC On/Off is a portable application that graphically displays the time a computer has been in use for the past 3 weeks. The best thing about this application is that it does not perform any registry tweaks, and does not require initiating logging. It displays the operational hours with a simple graphical overview, so you can see at what times the computer was on or off. You can even connect a network computer, and create a report of the operational hours of a computer. In the chart that is displayed, a grey fade-out indicates that the computer switched into standby mode (in Windows 7/Vista or higher), whereas, a red bar indicates that the computer was shut down unexpectedly (Windows event ID: 6008), followed by a reboot.
PC On/Off works on Windows XP, Windows Vista, Windows 7, Windows 2003 and Windows 2008.