I think so! I think I've done tests before, comparing total time and time actually running, but I could be wrong. Maybe I'll have to try again anyway.
Now there is one command that will give you the same time as task manager, but another command (I forget what it is) that gives you the longer, total time.
EDIT Ahah! I figured it out. The systeminfo command takes the task manager up time and uses that to predict a boot time, which is incorrect if you've slept (or possibly hibernated) your computer since last reboot. net stats workstation is the command that gives the correct boot time.
Yes!