There are 3 ocurrences of 'Adams' in A1:A19 and 3 occurrences of '08:00:00'
(in time format) between C1:C19, linked to Adams. There is one occurrence of
Adams - 08:15:00:00 between A1:A19 and C1:C19.

What function and formula would I use in A20 to return a value of 3 (i.e. to
count the Adams at 08:00:00 occurreces)?

If I wanted to count Adams (Column A) and (in date format) say, 27/9/06 (in
column B), would I use the same formula?