A couple years ago, I read a book about a boy that was able to imagine a clock in his head, and make the hands of the clock spin, forward and backwards, allowing him to travel through time. I believe that the clock that he was imagining was a grandfather clock, and he had help from a another person who had the same power. Also, there was something about him coming home and finding his house burned down.
The book "There will be Time" by Poul Anderson seems to meet your criteria. The boy's name is Jack. I don't know about the clock in the head, but he does meet other people with the same ability from a variety of time periods.