Why does your clock say 7:03?

Rob and I get up each morning at 6 to get ready for the day before the boys wake up. This morning, Rob was first to get up and I decided to take a few extra minutes to rest. After what seemed like just a few minutes, I heard Bobby calling from upstairs. I go up there and tell him that it is not quite time to get up - and then glance at his clock which reads 7:03. My first thought was on no - I have slept in and we need to get moving! I grab his clothes and head downstairs to start breakfast but he wanted to stop in and say good morning to Rob first. As we head into our room, I notice that OUR clock reads 6:23 - what???? Turns out that Bobby woke up early and then figured out how to change the time on his clock so that it read after 7 - when he could get up. :) I was pretty impressed.