A clock for the Blender Game Engine, I have created before a while.
I only used logic editor, without Python. A interesting things would be, too Transferred to the computer clock time on the in-game clock.
I hope the clock is running correctly in continuous duty, I have not tested yet. But which player looked at the a clock in a game whether the work properly.
For those not interested in BGE, I have attached a version of the clock for the Cyclesrrender :)
Have fun with it, and feel free to use the clock for your project:)
Here's a short demonstration video: