[pschastain]

Changing back 01/01/1970 via Date & Time preferences doesn't need authentication, but the exploit still didn't work, at least for me.

[acdha]

> Changing back 01/01/1970 via Date & Time preferences doesn't need authentication

This is not true but it can be confusing if you've authenticated at all recently due to a grace period like sudo's.

[nwh]

I've never unlocked that panel, and I've rebooted recently, and still didn't need authentication. Are you sure that's as right?

[adestefan]

The authentication for changing things via the System Preferences system is independent of sudo and "sticks" across reboots.

[glitch]

Is your account an Administrator account? Normal users are just Standard accounts and not Administrators.