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Excel/Totaling a number of people scheduled at certain times

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Question
Hello, I'm trying to figure out a way to have excel read start and end times in my agents shift to show how many are present at a certain time. For instance:

Agent schedules
Agent A - 8:00:00 AM - 6:00:00 PM
Agent B - 9:30:00 AM - 7:00:00 PM
Agent C - 10:00:00 AM - 8:00:00 PM

I want excel to show:
8:00   1
8:30   1
9:00   1
9:30   2
10:00   3
10:30   3  

Answer
New sheet, select cols A:D, Format, Cells, Number, Category: Time, Type: 1:30 PM, OK.

In A1:A3, enter:

8:00 AM
9:30 AM
10:00 AM

In B1:B3, enter:

6:00 PM
7:00 PM
8:00 PM

Range A1:B3 now shows the start/end times for the three agents.

In D1, enter:

8:00 AM

In D2, enter:

=D1+1/24/2

and copy down thru D2:D6.

In E1, enter:

=SUM(IF(D1>=$A$1:$A$3,IF(D1<=$B$1:$B$3,1,0)))

as an ARRAY (i.e., type the formula into cell, then instead of hitting the Enter key, hit Ctrl-Shift-Enter). Then copy down thru E1:E6.

Range D1:E6 now shows the results you want.
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