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

> 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.

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

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

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