Excel Days , Hours , Minutes and Seconds ( dd hh: mm: ss ) COUNTDOWN

Hello ,

Please Have a question how to make two dates difference to Countdown
Example:
A1 Starting Date : 01/Jan/2013 08:12:10 Am
B1 End Date : 10 / Jan / 2013 07: 10: 05 Am

C1 Difference 10 01: 00 : 05 ( dd hh:mm:ss )

I would like to have it displayed and the Seconds counting 1, 2, 3......59


Thank you