Gday
I no this was brought up in a previous topic, but these new ZRE corollas' some of you guys had a prob with 24 hour clock on the dash. I may have found your answer to the problem.
If you still have the original toyota headunit in the car you could display the normal 12hour clock on there. And to do this all you have to do is the combination of either pressing seek up than 4 or 4 than seek up, hold that for a few seconds than the clock should activate on the headunit. And to adjust the time just hold AM and press 1 to change the hour and AM and 2 to change the minutes. During all this the headunit has to be switched off.
I hope this maybe helpful to a few of you.
Pricey..