A 555 timer is useless if you want to read time. You would not want to go to school a early 10 minutes after you set it a hour ago! 555 timers are horrible, but fun.
Get a binary clock schematic off the internet, and replace the crystal oscillator with a 555 oscillator. If you don't know how to design the 555 oscillator, there are plenty of 555 tutorials on the internet.
Perhaps this would be a good time to learn.
See, the problem is, no one here is likely to have exactly what you need on their personal computer. We are going to have to Google it. You might as well do it yourself.
EDIT: A Google image search for "binary clock schematic" gives absolutely thrilling results.
That circuit syncs up a 555 to the AC line, then divides it by 60 to give you a 1Hz clock. If the AC line fails, the 555 will continue to oscillate at close to 60Hz, so your time is not too far off when the power comes back on. Is that what you want, or do you just want a 555 running at 1Hz?