Well, they ‘almost’ got it right. (ignoring the fact that they waited until the last minute like everyone else and grossly underestimated the effort involved in everyone updating)
Most things work, and have the right time. That is unless you have a 797x color phone. You know one of the ‘good’ phones, the expensive ones.

If you have one of these, check the time. Is it right?
It probably is because when you did your update you rebooted all of the phones right?
Now reach around back and unplug it (if you are using this powered over Ethernet simply unplug the cable, if you have a power brick, just unplug that).
Let the phone boot up.
What time does your phone say now? Yeah, that’s what I thought, it’s back to the wrong time.
Now simply reset your phone, ‘hit settings, **#**’ and viola!, you’re back to the right time.
So what’s the difference from a ‘powered-off boot’ and a reset/reboot? And why does that screw up the time? Who knows, but it’s stuff like this that drive us absolutely crazy.