For the Windows operating system, there are additional gadgets that display information on the current state of the OS, including the operating time, on the desktop. However, the OS itself has utilities that allow you to determine the time of its loading. In different versions of the system, their work is not organized in the same way, but one way or another, they can be used to find out the time when the computer was turned on.
Instructions
Step 1
If you need to determine the time to turn on a computer running Windows Vista or Windows 7, you can do this using a system component called "Task Manager". To launch it, right-click the free space on the taskbar and select the item that is called "Task Manager" in the pop-up context menu. Alternatively, you can use the hotkey combination CTRL + alt="Image" + Delete.
Step 2
Go to the "Performance" tab and among other information find in the "System" section the line "Working hours". By subtracting the period specified in this line from the current time, you can determine when the computer was turned on.
Step 3
Use the systeminfo utility if you need a method that works for Windows XP too. This system program runs on the command line, so start by opening a command line terminal. Expand the main menu on the "Start" button, and select the "Run" line to open the program launch window. The same can be done by pressing the WIN + R key combination. In the input field, type cmd, press the Enter key and the system will give you the opportunity to use the DOS command emulator.
Step 4
Type systeminfo at the command line. You can select and copy (CTRL + C) the utility name here, and then right-click the black terminal screen and select the "Paste" line in the pop-up context menu. Then press the Enter key and the utility will collect information about your system. This process will take a few seconds, after which a long table with various data will be displayed on the terminal screen.
Step 5
Go to the beginning of the table and find the line "System boot time" - it will contain the desired turn-on time. But this line is only in Windows Vista and Windows 7, and in Windows XP, instead of it there is an inscription "System uptime", so you will have to subtract the time specified here from the current clock reading yourself.
