Newpep is right.. but I think this might work. Take note of the exact time your tama hatched. You will see in one hour, that at the exact same time, just an hour later, your tama is a child! now after one day, put the exact time for it to become a teenager! You can also do the same for an adult! Perosnaly, I'd rather take care of my tamas the proper way and get a little suprise when ever it evolves! Good luck!