count the number of consecutive months

C

CarrieLiz

New Member
Joined
May 11, 2011
Messages
2
I am looking for a way to count the number of consecutive months for a given name. I have names in one column and dates in another column. I want to put the number of consecutive months (using the date field) for each name in a new column. I have copied some data below. I would like to automatically populate the number in the count column.
Thanks in advance

<TABLE style="WIDTH: 167pt; BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width=223 border=0 x:str><COLGROUP><COL style="WIDTH: 66pt; mso-width-source: userset; mso-width-alt: 3218" width=88><COL style="WIDTH: 53pt; mso-width-source: userset; mso-width-alt: 2596" width=71><COL style="WIDTH: 48pt" width=64><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; WIDTH: 66pt; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" width=88 height=17>Name</TD><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT: windowtext; WIDTH: 53pt; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" width=71>Date</TD><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext 0.5pt solid; BORDER-LEFT: windowtext; WIDTH: 48pt; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" width=64>Count</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext 0.5pt solid; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Joe Smith</TD><TD class=xl29 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" x:num="40476">10/25/2010</TD><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right x:num>4</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext 0.5pt solid; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Joe Smith</TD><TD class=xl30 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" x:num="40507">11/25/2010</TD><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"> </TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext 0.5pt solid; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Joe Smith</TD><TD class=xl31 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" x:num="40568">1/25/2011</TD><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"> </TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext 0.5pt solid; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Joe Smith</TD><TD class=xl32 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" x:num="40599">2/25/2011</TD><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"> </TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext 0.5pt solid; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Joe Smith</TD><TD class=xl33 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" x:num="40627">3/25/2011</TD><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"> </TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext 0.5pt solid; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Joe Smith</TD><TD class=xl34 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" x:num="40658">4/25/2011</TD><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"> </TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext 0.5pt solid; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Mary Johnson</TD><TD class=xl29 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" x:num="40568">1/25/2011</TD><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right x:num>2</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext 0.5pt solid; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Mary Johnson</TD><TD class=xl29 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" x:num="40599">2/25/2011</TD><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"> </TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext 0.5pt solid; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Mary Johnson</TD><TD class=xl29 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" x:num="40658">4/25/2011</TD><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"> </TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext 0.5pt solid; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Steve Jones</TD><TD class=xl29 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" x:num="40507">11/25/2010</TD><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" align=right x:num>0</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext 0.5pt solid; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Steve Jones</TD><TD class=xl29 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" x:num="40568">1/25/2011</TD><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"> </TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext 0.5pt solid; BORDER-BOTTOM: windowtext 0.5pt solid; HEIGHT: 12.75pt; BACKGROUND-COLOR: transparent" height=17>Steve Jones</TD><TD class=xl29 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent" x:num="40658">4/25/2011</TD><TD class=xl35 style="BORDER-RIGHT: windowtext 0.5pt solid; BORDER-TOP: windowtext; BORDER-LEFT: windowtext; BORDER-BOTTOM: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent"> </TD></TR></TBODY></TABLE>
 

Excel Facts

How can you turn a range sideways?
Copy the range. Select a blank cell. Right-click, Paste Special, then choose Transpose.
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First, place the following code for the custom function in a regular module...

Code: 
[font=Verdana][color=darkblue]Option[/color] [color=darkblue]Explicit[/color]

[color=darkblue]Public[/color] [color=darkblue]Function[/color] MaxFreq(x [color=darkblue]As[/color] [color=darkblue]Variant[/color]) [color=darkblue]As[/color] [color=darkblue]Long[/color]
    [color=darkblue]Dim[/color] MyArray() [color=darkblue]As[/color] [color=darkblue]Variant[/color]
    [color=darkblue]Dim[/color] temp [color=darkblue]As[/color] [color=darkblue]Variant[/color]
    [color=darkblue]Dim[/color] y [color=darkblue]As[/color] [color=darkblue]Variant[/color]
    [color=darkblue]Dim[/color] Cnt [color=darkblue]As[/color] [color=darkblue]Long[/color]
    [color=darkblue]Dim[/color] i [color=darkblue]As[/color] [color=darkblue]Long[/color]
    [color=darkblue]Dim[/color] j [color=darkblue]As[/color] [color=darkblue]Long[/color]
    [color=darkblue]If[/color] TypeName(x) = "Range" [color=darkblue]Then[/color]
        [color=darkblue]For[/color] [color=darkblue]Each[/color] y [color=darkblue]In[/color] x.Cells
            [color=darkblue]If[/color] WorksheetFunction.IsNumber(y) [color=darkblue]Then[/color]
                Cnt = Cnt + 1
                [color=darkblue]ReDim[/color] [color=darkblue]Preserve[/color] MyArray(1 [color=darkblue]To[/color] Cnt)
                MyArray(Cnt) = y
            [color=darkblue]End[/color] [color=darkblue]If[/color]
        [color=darkblue]Next[/color] y
    [color=darkblue]ElseIf[/color] IsArray(x) [color=darkblue]Then[/color]
        [color=darkblue]For[/color] [color=darkblue]Each[/color] y [color=darkblue]In[/color] x
            [color=darkblue]If[/color] WorksheetFunction.IsNumber(y) [color=darkblue]Then[/color]
                Cnt = Cnt + 1
                [color=darkblue]ReDim[/color] [color=darkblue]Preserve[/color] MyArray(1 [color=darkblue]To[/color] Cnt)
                MyArray(Cnt) = y
            [color=darkblue]End[/color] [color=darkblue]If[/color]
        [color=darkblue]Next[/color] y
    [color=darkblue]End[/color] [color=darkblue]If[/color]
    [color=darkblue]For[/color] i = [color=darkblue]LBound[/color](MyArray) [color=darkblue]To[/color] [color=darkblue]UBound[/color](MyArray) - 1
        [color=darkblue]For[/color] j = i + 1 [color=darkblue]To[/color] [color=darkblue]UBound[/color](MyArray)
            [color=darkblue]If[/color] MyArray(i) > MyArray(j) [color=darkblue]Then[/color]
                temp = MyArray(j)
                MyArray(j) = MyArray(i)
                MyArray(i) = temp
            [color=darkblue]End[/color] [color=darkblue]If[/color]
        [color=darkblue]Next[/color] j
    [color=darkblue]Next[/color] i
    Cnt = 0
    [color=darkblue]For[/color] i = [color=darkblue]LBound[/color](MyArray) [color=darkblue]To[/color] [color=darkblue]UBound[/color](MyArray) - 1
        [color=darkblue]If[/color] DateSerial(Year(MyArray(i)), Month(MyArray(i)) + 1, 1) = DateSerial(Year(MyArray(i + 1)), Month(MyArray(i + 1)), 1) [color=darkblue]Then[/color]
            Cnt = Cnt + 1
            [color=darkblue]If[/color] Cnt > MaxFreq [color=darkblue]Then[/color] MaxFreq = Cnt
        [color=darkblue]Else[/color]
            Cnt = 0
        [color=darkblue]End[/color] [color=darkblue]If[/color]
    [color=darkblue]Next[/color] i
    [color=darkblue]If[/color] MaxFreq > 0 [color=darkblue]Then[/color] MaxFreq = MaxFreq + 1
[color=darkblue]End[/color] [color=darkblue]Function[/color]
[/font]

Then, assuming that A2:B13 contains the data, try the following...

Code: 
If the data is sorted by Name, in ascending order, as per your example:

Select cell C2

Formulas > Defined Names > Defined Name or Insert > Name > Defined

Name:  MyRange

Refers to:

=INDEX(Sheet1!$B$2:$B$13,MATCH(Sheet1!$A2,Sheet1!$A$2:$A$13,0)):INDEX(Sheet1!$B$2:$B$13,MATCH(Sheet1!$A2,Sheet1!$A$2:$A$13,1))

Change the sheet name, accordingly.

Click Ok

C2, copied down:

=IF(A2<>A1,MaxFreq(MyRange),"")

Code: 
If the data is not sorted, try the following instead...

C2, confirmed with CONTROL+SHIFT+ENTER, and copied down:

=IF(COUNTIF($A$2:A2,A2)=1,MaxFreq(IF($A$2:$A$13=A2,$B$2:$B$13)),"")
 
Upvote 0
Hi,

A possible solution using formulas.

A B C
<TABLE style="WIDTH: 190pt; BORDER-COLLAPSE: collapse" border=0 cellSpacing=0 cellPadding=0 width=253><COLGROUP><COL style="WIDTH: 70pt; mso-width-source: userset; mso-width-alt: 3401" width=93><COL style="WIDTH: 60pt; mso-width-source: userset; mso-width-alt: 2925" span=2 width=80><TBODY><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: #c5d9f1; WIDTH: 70pt; HEIGHT: 15pt; BORDER-TOP: windowtext 0.5pt solid; BORDER-RIGHT: windowtext 0.5pt solid" class=xl68 height=20 width=93>Name

</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: #c5d9f1; WIDTH: 60pt; BORDER-TOP: windowtext 0.5pt solid; BORDER-RIGHT: windowtext 0.5pt solid" class=xl68 width=80>Date</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: #c5d9f1; WIDTH: 60pt; BORDER-TOP: windowtext 0.5pt solid; BORDER-RIGHT: windowtext 0.5pt solid" class=xl68 width=80>Count</TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl65 height=20>Joe Smith</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl66 align=right u1:num="40476">25/10/2010</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl67 align=right>4</TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl65 height=20 u1:num>Joe Smith</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl66 align=right u1:num="40507">25/11/2010</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl67> </TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl65 height=20 u1:num>Joe Smith</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl66 align=right u1:num="40568">25/01/2011</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl67> </TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl65 height=20 u1:num>Joe Smith</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl66 align=right u1:num="40599">25/02/2011</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl67> </TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl65 height=20 u1:num>Joe Smith</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl66 align=right u1:num="40627">25/03/2011</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl67> </TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl65 height=20 u1:num>Joe Smith</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl66 align=right u1:num="40658">25/04/2011</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl67> </TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl65 height=20 u1:num>Mary Johnson</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl66 align=right u1:num="40568">25/01/2011</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl67 align=right>2</TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl65 height=20 u1:num>Mary Johnson</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl66 align=right u1:num="40599">25/02/2011</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl67> </TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl65 height=20 u1:num>Mary Johnson</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl66 align=right u1:num="40658">25/04/2011</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl67> </TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl65 height=20 u1:num>Steve Jones</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl66 align=right u1:num="40507">25/11/2010</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl67 align=right>0</TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl65 height=20 u1:num>Steve Jones</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl66 align=right u1:num="40568">25/01/2011</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl67> </TD></TR><TR style="HEIGHT: 15pt" height=20><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext 0.5pt solid; BACKGROUND-COLOR: transparent; HEIGHT: 15pt; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl65 height=20 u1:num>Steve Jones</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl66 align=right u1:num="40658">25/04/2011</TD><TD style="BORDER-BOTTOM: windowtext 0.5pt solid; BORDER-LEFT: windowtext; BACKGROUND-COLOR: transparent; BORDER-TOP: windowtext; BORDER-RIGHT: windowtext 0.5pt solid" class=xl67> </TD></TR></TBODY></TABLE>

To avoid a "monster-formula" create a named formula

Select C2 (very important)
Formulas>Names Manager and enter
Name: arrayDates
Refers To:
=IF($A$2:$A$200=$A2,DATE(YEAR($B$2:$B$200),MONTH($B$2:$B$200)-(ROW($B$2:$B$200)-ROW($B$2)+1),DAY($B$2:$B$200)),"")

Then in C2 enter this array-formula
=IF(COUNTIF($A$2:A2,A2)=1,IF(ISNA(MODE(arrayDates)),0,MAX(FREQUENCY(arrayDates,arrayDates))),"")

confirmed with Ctrl+Shift+Enter
(hold down both Ctrl and Shift keys and hit Enter)

copy down

HTH

M
 
Upvote 0
Try:-
Code: 
[COLOR="Navy"]Sub[/COLOR] MG13May30
[COLOR="Navy"]Dim[/COLOR] Rng [COLOR="Navy"]As[/COLOR] Range
[COLOR="Navy"]Dim[/COLOR] Dn [COLOR="Navy"]As[/COLOR] Range
[COLOR="Navy"]Dim[/COLOR] Q, K
[COLOR="Navy"]Set[/COLOR] Rng = Range(Range("A2"), Range("A" & rows.Count).End(xlUp))
    [COLOR="Navy"]With[/COLOR] CreateObject("scripting.dictionary")
        .CompareMode = vbTextCompare
[COLOR="Navy"]For[/COLOR] [COLOR="Navy"]Each[/COLOR] Dn [COLOR="Navy"]In[/COLOR] Rng
    [COLOR="Navy"]If[/COLOR] Not .Exists(Dn.value) [COLOR="Navy"]Then[/COLOR]
        .Add Dn.value, Array(Dn(, 2), 1, 1, Dn)
    [COLOR="Navy"]Else[/COLOR]
        Q = .Item(Dn.value)
            [COLOR="Navy"]If[/COLOR] DateValue(Dn(, 2)) = DateValue(DateAdd("m", 1, Q(0))) [COLOR="Navy"]Then[/COLOR]
                Q(1) = Q(1) + 1
                Q(0) = Dn(, 2)
            [COLOR="Navy"]Else[/COLOR]
                Q(2) = Q(1)
                Q(1) = 1
                Q(0) = Dn(, 2)
            [COLOR="Navy"]End[/COLOR] If
        .Item(Dn.value) = Q
    [COLOR="Navy"]End[/COLOR] If
[COLOR="Navy"]Next[/COLOR]
[COLOR="Navy"]For[/COLOR] [COLOR="Navy"]Each[/COLOR] K [COLOR="Navy"]In[/COLOR] .keys
    .Item(K)(3).Offset(, 2) = Application.Max(.Item(K)(1), .Item(K)(2))
    .Item(K)(3).Offset(, 2) = IIf(.Item(K)(3).Offset(, 2) = 1, 0, .Item(K)(3).Offset(, 2))
[COLOR="Navy"]Next[/COLOR] K
[COLOR="Navy"]End[/COLOR] [COLOR="Navy"]With[/COLOR]
[COLOR="Navy"]End[/COLOR] [COLOR="Navy"]Sub[/COLOR]
Regards Mick
 
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