I want to find the latest date in Excel for a particular item from the list of thousand of items

Question

So in the above example for the first item I want the latest date to be 17th July

Answer 1

With Office 365 use MAXIFS:

=MAXIFS(B:B,A:A,A2)

With Older USE AGGREGATE:

=AGGREGATE(14,6,$B$2:$B$20/($A$2:$A$20=A2),1)

Answer 2

For pre-xl2010 use a psuedo-MAXIFS.

=MAX(INDEX($B$2:$B$20+($A$2:$A$20<>A2)*-1e99, , ))