This is pretty tricky.
If you set up your desired start time in I1 (like 9:00) and desired end time
in J1 (like 12:00), then you'd use this formula wherever you like:
=SUMPRODUCT((B2:B100<=$J$1)*(C2:C100=$I$1))
This will test for anyone whose start time is before the desired end time
AND whose end time is after the desired start time.
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"The Rook" wrote:

Can anyone let me know the best way to handle thin on?
Sheet 1
In column A I have a list of employees, in column B I have a list of their
start times and in column C I have a list of their finish times.

What I am wanting to do is caculate how many employees are at work during
specific hours. ie 09:00 to 12:00 of 10:00 to 15:00.

I was trying to use some sort of COUNTIF statement but could not get
anything to work which got me thinking is the is a totally different way to
do this.

Thanks