Does anyone have any suggestions on how to use index and match function for
determining the value?

Under the column A, there is a list of number,
Under the column B, there is a list of date,
Under the column C, there is a list of time,

1 3-Aug-09 10:15 AM [row 14]
2 3-Aug-09 10:30 AM
3 3-Aug-09 10:45 AM
4 3-Aug-09 11:00 AM
5 3-Aug-09 11:15 AM
6 3-Aug-09 11:30 AM
7 3-Aug-09 11:45 AM
8 3-Aug-09 12:00 PM
9 3-Aug-09 12:15 PM [row 22]

There is a given date in cell C1 3-Aug-09, and
there is a given time in cell C2 11:15 PM
I would like to determine the value under column A, which match both of the
date and time, and it should return 5 in cell C10.

Does anyone have any suggestions on how to do it in Excel?
Thanks in advance for any suggestions
Eric