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Excel/oldest and latest dates for unique list

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Question
Hi, Tom

Given the data below, is there a formula to determine the oldest and latest dates for a to e as shown below?

Data
e   10-Jan-59
a   10-Feb-70
e   23-Apr-70
b   24-Jan-75
c   10-Feb-12
d   23-Mar-13
e   5-Apr-15
a   6-Apr-15
c   7-Apr-15
d   8-Apr-15
c   9-Apr-15
d   10-Apr-15
a   11-Apr-15
c   12-Apr-15
b   13-Apr-15
d   14-Apr-15
b   15-Apr-15
d   16-Apr-15
e   17-Apr-15
a   18-Apr-15
c   19-Apr-15
d   20-Apr-15
c   21-Apr-15
d   22-Apr-15
a   23-Apr-15
c   24-Apr-15
b   25-Apr-15
d   26-Apr-15
e   27-Apr-15
b   28-Apr-15
e   29-Apr-15
a   30-Apr-15
c   1-May-15
e   2-May-15
c   3-May-15
b   4-May-15

Solution
  Oldest          Latest
a   10-Feb-70   23-Mar-13
b   24-Jan-75   10-Apr-15
c   10-Feb-12   19-Apr-15
d   23-Mar-13   27-Apr-15
e   10-Jan-59   4-May-15

Many thanks

Yu
Sydney, Australia

Answer
Yu,

assume A1:A36 holds your letters and B1:B36 holds your dates


D1: a
D2: b
D3: c
D4: d
D5: e

E1:  =MIN(IF($A$1:$A$36=$D1,$B$1:$B$36,100000)*1)   entered with Ctrl+Shift+Enter rather than just enter since this is an array formula
F1:  =MAX(IF($A$1:$A$36=D1,$B$1:$B$36,-1)*1)  entered with Ctrl+Shift+Enter rather than just enter since this is an array formula

Format both E1 and F1 as  dd-mmm-yy

then select E1:F1 and drag fill down to E5:F5

that produced this output:  

a   10-Feb-70   30-Apr-15
b   24-Jan-75   4-May-15
c   10-Feb-12   3-May-15
d   23-Mar-13   26-Apr-15
e   10-Jan-59   2-May-15

My oldest dates agree with yours, but my latest dates don't.  However, your latest dates appear to be wrong.   

--
Regards,
Tom Ogilvy  
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Tom Ogilvy

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Selected as an Excel MVP by Microsoft since 1999. Answering Excel questions in Allexperts since its inception in 2001. Able to answer questions on almost all aspects of Excel's internal capabilities. If seeking a VBA solution, please specify that in your question itself so I give you the answer you want. [Excel has weak protection - if you are distributing an application, I don't answer questions on how to protect your project from your users.]

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