

If you work on your computer, and you put the pc into sleep/standby, and you press a key to wake it up, you are still using the computer, and windows does not consider that a moment to say: uptime has to be reset.

Seeing the comments, lets address a bit more why a shutdown is not seen as system uptime reset, where a reboot is. The timer on my task manager still says 2 days ago, even though the pc was turned off last night. Not to be confused with turn off and on, given that you close all applications and put the pc into hiberation if fast boot is turned on.įor example, I rebooted my pc 2 days ago, but shutdown and started twice after.

It counts from the last moment you restarted your pc. The format is indeed days:hours:minutes:seconds.
