I'm trying out Linux Mint 13 Maya with Cinnamon. I dunno, I guess I am getting kind of tired of Ubuntu? So we'll see how Mint stacks up. So far it looks very nice. I guess I am getting tired of the Unity theme and poor multi-monitor support. Although, I've first installed Mint on one of my laptops side-by-side with Ubuntu. Pretty easy installation using a USB stick.
Anyways, I was trying to adjust the time and in the Cinnamon Settings under Calender it requires a "code" of types. Go here to get the look you want.
I found that if you go to the Date and Time under System Tools and System Settings you can change the date and time normally.