excel - count people scheduled at work -

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i have table shift start , end times, #n/a if person not due in @ all.

(sample)

mon start   mon end  8:15       16:45  8:15       16:45  8:15       16:45 11:30       20:00  #n/a        #n/a  8:15       16:45  8:45       17:15  9:30       18:00 13:30       22:00

i know how many people due on @ specified time
e.g. if select 9:00 time, expect result 5 query, , if select 21:00, expect 1.

i have tried countif =countif(a2:a93,"<"&d2)-countif(b2:b93,">="&d2), produces negative numbers start of day, , positive end of day.

with sumproduct, =sumproduct(--(a2:a93>=d2),--(b2:b93<d2)), can 0 answer

could point out going wrong?

sumproduct won't ignore #n/a error values, if have excel 2007 or later try using countifs this

=countifs(a2:a93,"<="&d2,b2:b93,">="&d2)


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