This clock needs JavaScript to tick.
Each row is one number: hours on top, then minutes, then seconds. From left to right the lights are worth 32, 16, 8, 4, 2 and 1. Add up the lit ones and you have the time.
Turn on Hints to see what each column is worth, and Answers to check yourself.
Keys: H hints, A answers, F full screen, I info.
Paste this where you want the clock to appear. It scales with the width you give the frame.