If you leave your computer on for extended periods of time, it’s usually a good idea to perform a reboot now and then. Furthermore, if you’re managing multiple computers, it’s difficult to remember when each received a reboot. That’s why Windows keeps track of your total up-time and the last time your computer booted for you. Here’s how to access those pieces of information:
To find total up-time:
Step 1: Launch the task manager. You can do this in one of three ways:
Choice 1: Press Ctrl+Alt+Delete. On the screen that appears, select Start Task Manager.
Choice 2: Right click on the taskbar and select Start Task Manager.
Choice 3: Press CtrlL+Shift+Esc to launch the task manager directly.
Step 2: In this window, click on the Performance tab.
Step 3: Your system’s up-time is displayed next to Up Time (highlighted in the above picture) in the format of Days: Hours: Minutes: Seconds
To find last boot date:
Go to Start –> Run –> cmd
In the command prompt, run the following commands: systeminfo | find /i “Boot Time”
-or-
systeminfo | find “Time:”
-or-
systeminfo | find “System Boot Time”
Cheers,
Happy Computing 🙂
source: cnet, superuser, serverfault
lakkireddymadhu 