I am looking for a way to calculate the number of Days, Hours, minutes and Seconds between 2 dates and times:

eg.

A1 = 10/10/11 B1 = 15/10/11
A2 = 1:30:00 B2 = 13:30:00

I would also like the answer to apear in number formay:

eg.

A3 = 5.5 Days

Any help with my question will be greatly appreciated.

Thank you