Error in macro

A

Aurora118

New Member
Joined
Oct 10, 2007
Messages
42
Hi,

I am new to writing macros and have written the following macro but it doesn't work properly.


I have four columns with dates and I need to find the number of month between the dates.
Example:

Between col C and D, but if column C is blank, then, between col B and D and if col B is blank, then A and D.

And if A,B and C are all blank then I need the result to be blank.


Sub Calc_Dates_Stat4()

Dim prev_date As Date
Dim curr_date As Date
Dim Months
Dim NA As Boolean

Range("r2").Select

Do Until IsEmpty(Range("o" & ActiveCell.Row))

NA = False

If IsEmpty(Range("d" & ActiveCell.Row)) Then
NA = True
Else
curr_date = Range("d" & ActiveCell.Row).Value
End If

If IsEmpty(Range("c" & ActiveCell.Row)) Then

If IsEmpty(Range("b" & ActiveCell.Row)) Then
NA = True

If IsEmpty(Range("a" & ActiveCell.Row)) Then
NA = True
Else: prev_date = Range("a" & ActiveCell.Row).Value
End If

Else: prev_date = Range("b" & ActiveCell.Row).Value
End If


Else
prev_date = Range("c" & ActiveCell.Row).Value
End If

If NA = False Then
ActiveCell.Value = MonthDiff(prev_date, curr_date)
End If

ActiveCell.Offset(1, 0).Select

Loop

End Sub



At the moment it is not calculating if Col B and Col C are both blank.

Can anyone please help?


Thanks
 
Sort by date Sort by votes
MrKowz said:
I assumed your highest date would be in Column D.

Try:

Excel 2007<TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2><COLGROUP><COL style="BACKGROUND-COLOR: #e0e0f0" width=25><COL><COL><COL><COL><COL></COLGROUP><THEAD><TR style="TEXT-ALIGN: center; BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH></TH><TH>A</TH><TH>B</TH><TH>C</TH><TH>D</TH><TH>E</TH></TR></THEAD><TBODY><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">1</TD><TD style="TEXT-ALIGN: right">1/2/2007</TD><TD style="TEXT-ALIGN: right"></TD><TD style="TEXT-ALIGN: right">5/10/2008</TD><TD style="TEXT-ALIGN: right">1/6/2007</TD><TD style="TEXT-ALIGN: right">16</TD></TR></TBODY></TABLE><TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2><THEAD><TR style="TEXT-ALIGN: center; BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH>Sheet1</TH></TR></TD></THEAD><TBODY></TBODY></TABLE>

<TABLE style="BORDER-BOTTOM: black 2px solid; BORDER-LEFT: black 2px solid; PADDING-BOTTOM: 0.4em; BACKGROUND-COLOR: #ffffff; PADDING-LEFT: 0.4em; PADDING-RIGHT: 0.4em; BORDER-COLLAPSE: collapse; BORDER-TOP: black 2px solid; BORDER-RIGHT: black 2px solid; PADDING-TOP: 0.4em" rules=all cellPadding=2 width="85%"><TBODY><TR><TD style="PADDING-BOTTOM: 6px; PADDING-LEFT: 6px; PADDING-RIGHT: 6px; PADDING-TOP: 6px">Worksheet Formulas<TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; TEXT-ALIGN: center; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2 width="100%"><THEAD><TR style="BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH width=10>Cell</TH><TH style="TEXT-ALIGN: left; PADDING-LEFT: 5px">Formula</TH></TR></THEAD><TBODY><TR><TH style="BACKGROUND-COLOR: #e0e0f0; COLOR: #161120" width=10>E1</TH><TD style="TEXT-ALIGN: left">=DATEDIF(MIN(LOOKUP(9.99E+307,A1:C1),D1),MAX(LOOKUP(9.99E+307,A1:C1),D1),"m")</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
Click to expand...

Hi

Amazing solution

I don't understand how LOOKUP(largenumber,RangeofDates) manages to return the right most date of RangeofDates regardless of ranges different values when in theory is should return the largest date regardless of position


<TABLE style="WIDTH: 374pt; BORDER-COLLAPSE: collapse" border=0 cellSpacing=0 cellPadding=0 width=499><COLGROUP><COL style="WIDTH: 53pt; mso-width-source: userset; mso-width-alt: 2596" width=71><COL style="WIDTH: 107pt; mso-width-source: userset; mso-width-alt: 5193" width=142><COL style="WIDTH: 53pt; mso-width-source: userset; mso-width-alt: 2596" span=2 width=71><COL style="WIDTH: 48pt" width=64><COL style="WIDTH: 60pt; mso-width-source: userset; mso-width-alt: 2925" width=80><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 height=17 width=71 align=right>12/03/2009</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 107pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" id=td_post_2723593 class=xl63 width=142 align=right>12/03/2001</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=71></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=71 align=right>20/03/2019</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 48pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" width=64 align=right>0</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 60pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=80 align=right>12/03/2001</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17>Can You explain?</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63></TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63></TD></TR></TBODY></TABLE>
 
Upvote 0

Excel Facts

Lock one reference in a formula
Need 1 part of a formula to always point to the same range? use $ signs: $V$2:$Z$99 will always point to V2:Z99, even after copying
CharlesChuckieCharles said:
Hi

Amazing solution

I don't understand how LOOKUP(largenumber,RangeofDates) manages to return the right most date of RangeofDates regardless of ranges different values when in theory is should return the largest date regardless of position


<TABLE style="WIDTH: 374pt; BORDER-COLLAPSE: collapse" border=0 cellSpacing=0 cellPadding=0 width=499><COLGROUP><COL style="WIDTH: 53pt; mso-width-source: userset; mso-width-alt: 2596" width=71><COL style="WIDTH: 107pt; mso-width-source: userset; mso-width-alt: 5193" width=142><COL style="WIDTH: 53pt; mso-width-source: userset; mso-width-alt: 2596" span=2 width=71><COL style="WIDTH: 48pt" width=64><COL style="WIDTH: 60pt; mso-width-source: userset; mso-width-alt: 2925" width=80><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 height=17 width=71 align=right>12/03/2009</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 107pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" id=td_post_2723593 class=xl63 width=142 align=right>12/03/2001</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=71></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 53pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=71 align=right>20/03/2019</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 48pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" width=64 align=right>0</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; WIDTH: 60pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63 width=80 align=right>12/03/2001</TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17>Can You explain?</TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63></TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD></TR><TR style="HEIGHT: 12.75pt" height=17><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; HEIGHT: 12.75pt; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" height=17></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0"></TD><TD style="BORDER-BOTTOM: #f0f0f0; BORDER-LEFT: #f0f0f0; BACKGROUND-COLOR: transparent; BORDER-TOP: #f0f0f0; BORDER-RIGHT: #f0f0f0" class=xl63></TD></TR></TBODY></TABLE>
Click to expand...

9.99E+307 is a shortened version of 9.99999999999999E+307, often referred to as "BigNum", it is the largest number that excel can handle. When using a LOOKUP function, Excel compares the lookup value to the lookup range, and doesn't return the closest value, but rather the last value where the array isn't larger.

Lets look at this data for example:
Excel 2007<TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2><COLGROUP><COL style="BACKGROUND-COLOR: #e0e0f0" width=25><COL></COLGROUP><THEAD><TR style="TEXT-ALIGN: center; BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH></TH><TH>A</TH></TR></THEAD><TBODY><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">1</TD><TD style="TEXT-ALIGN: right">0</TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">2</TD><TD style="TEXT-ALIGN: right">5</TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">3</TD><TD style="TEXT-ALIGN: right">10</TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">4</TD><TD style="TEXT-ALIGN: right">15</TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">5</TD><TD style="TEXT-ALIGN: right">20</TD></TR></TBODY></TABLE><TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2><THEAD><TR style="TEXT-ALIGN: center; BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH>Sheet1</TH></TR></TD></THEAD><TBODY></TBODY></TABLE>



If we were to use =LOOKUP(11,A1:A5), we would expect for it to return 10. The reason is because Excel is essentially performing the following evaluation behind the scenes:
Excel 2007<TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2><COLGROUP><COL style="BACKGROUND-COLOR: #e0e0f0" width=25><COL><COL></COLGROUP><THEAD><TR style="TEXT-ALIGN: center; BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH></TH><TH>A</TH><TH>B</TH></TR></THEAD><TBODY><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">1</TD><TD style="TEXT-ALIGN: right">0</TD><TD style="TEXT-ALIGN: right">TRUE</TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">2</TD><TD style="TEXT-ALIGN: right">5</TD><TD style="TEXT-ALIGN: right">TRUE</TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">3</TD><TD style="TEXT-ALIGN: right">10</TD><TD style="TEXT-ALIGN: right">TRUE</TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">4</TD><TD style="TEXT-ALIGN: right">15</TD><TD style="TEXT-ALIGN: right">FALSE</TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">5</TD><TD style="TEXT-ALIGN: right">20</TD><TD style="TEXT-ALIGN: right">FALSE</TD></TR></TBODY></TABLE><TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2><THEAD><TR style="TEXT-ALIGN: center; BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH>Sheet1</TH></TR></TD></THEAD><TBODY></TBODY></TABLE>

<TABLE style="BORDER-BOTTOM: black 2px solid; BORDER-LEFT: black 2px solid; PADDING-BOTTOM: 0.4em; BACKGROUND-COLOR: #ffffff; PADDING-LEFT: 0.4em; PADDING-RIGHT: 0.4em; BORDER-COLLAPSE: collapse; BORDER-TOP: black 2px solid; BORDER-RIGHT: black 2px solid; PADDING-TOP: 0.4em" rules=all cellPadding=2 width="85%"><TBODY><TR><TD style="PADDING-BOTTOM: 6px; PADDING-LEFT: 6px; PADDING-RIGHT: 6px; PADDING-TOP: 6px">Worksheet Formulas<TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; TEXT-ALIGN: center; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2 width="100%"><THEAD><TR style="BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH width=10>Cell</TH><TH style="TEXT-ALIGN: left; PADDING-LEFT: 5px">Formula</TH></TR></THEAD><TBODY><TR><TH style="BACKGROUND-COLOR: #e0e0f0; COLOR: #161120" width=10>B1</TH><TD style="TEXT-ALIGN: left">=11>A1</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>


And the lookup is returning the value that is 1 element prior to the first FALSE, in this case, 10.

Now if we mix those numbers up, we get a different result:
Excel 2007<TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2><COLGROUP><COL style="BACKGROUND-COLOR: #e0e0f0" width=25><COL><COL><COL></COLGROUP><THEAD><TR style="TEXT-ALIGN: center; BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH></TH><TH>A</TH><TH>B</TH><TH>C</TH></TR></THEAD><TBODY><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">1</TD><TD style="TEXT-ALIGN: right">0</TD><TD style="TEXT-ALIGN: right">TRUE</TD><TD style="TEXT-ALIGN: right">0</TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">2</TD><TD style="TEXT-ALIGN: right">20</TD><TD style="TEXT-ALIGN: right">FALSE</TD><TD style="TEXT-ALIGN: right"></TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">3</TD><TD style="TEXT-ALIGN: right">15</TD><TD style="TEXT-ALIGN: right">FALSE</TD><TD style="TEXT-ALIGN: right"></TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">4</TD><TD style="TEXT-ALIGN: right">10</TD><TD style="TEXT-ALIGN: right">TRUE</TD><TD style="TEXT-ALIGN: right"></TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">5</TD><TD style="TEXT-ALIGN: right">5</TD><TD style="TEXT-ALIGN: right">TRUE</TD><TD style="TEXT-ALIGN: right"></TD></TR></TBODY></TABLE><TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2><THEAD><TR style="TEXT-ALIGN: center; BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH>Sheet1</TH></TR></TD></THEAD><TBODY></TBODY></TABLE>

<TABLE style="BORDER-BOTTOM: black 2px solid; BORDER-LEFT: black 2px solid; PADDING-BOTTOM: 0.4em; BACKGROUND-COLOR: #ffffff; PADDING-LEFT: 0.4em; PADDING-RIGHT: 0.4em; BORDER-COLLAPSE: collapse; BORDER-TOP: black 2px solid; BORDER-RIGHT: black 2px solid; PADDING-TOP: 0.4em" rules=all cellPadding=2 width="85%"><TBODY><TR><TD style="PADDING-BOTTOM: 6px; PADDING-LEFT: 6px; PADDING-RIGHT: 6px; PADDING-TOP: 6px">Worksheet Formulas<TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; TEXT-ALIGN: center; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2 width="100%"><THEAD><TR style="BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH width=10>Cell</TH><TH style="TEXT-ALIGN: left; PADDING-LEFT: 5px">Formula</TH></TR></THEAD><TBODY><TR><TH style="BACKGROUND-COLOR: #e0e0f0; COLOR: #161120" width=10>B1</TH><TD style="TEXT-ALIGN: left">=11>A1</TD></TR><TR><TH style="BACKGROUND-COLOR: #e0e0f0; COLOR: #161120" width=10>C1</TH><TD style="TEXT-ALIGN: left">=LOOKUP(11,A1:A5)</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>

It returned 0! The element of the lookup range prior to the first FALSE found!

So, by using 9.99E+307, it evaluates for TRUE at every single line. Since there is no false, Excel chooses the last TRUE line.
Excel 2007<TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2><COLGROUP><COL style="BACKGROUND-COLOR: #e0e0f0" width=25><COL><COL><COL></COLGROUP><THEAD><TR style="TEXT-ALIGN: center; BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH></TH><TH>A</TH><TH>B</TH><TH>C</TH></TR></THEAD><TBODY><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">1</TD><TD style="TEXT-ALIGN: right">0</TD><TD style="TEXT-ALIGN: right">TRUE</TD><TD style="TEXT-ALIGN: right">5</TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">2</TD><TD style="TEXT-ALIGN: right">20</TD><TD style="TEXT-ALIGN: right">TRUE</TD><TD style="TEXT-ALIGN: right"></TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">3</TD><TD style="TEXT-ALIGN: right">15</TD><TD style="TEXT-ALIGN: right">TRUE</TD><TD style="TEXT-ALIGN: right"></TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">4</TD><TD style="TEXT-ALIGN: right">10</TD><TD style="TEXT-ALIGN: right">TRUE</TD><TD style="TEXT-ALIGN: right"></TD></TR><TR><TD style="TEXT-ALIGN: center; COLOR: #161120">5</TD><TD style="TEXT-ALIGN: right">5</TD><TD style="TEXT-ALIGN: right">TRUE</TD><TD style="TEXT-ALIGN: right"></TD></TR></TBODY></TABLE><TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2><THEAD><TR style="TEXT-ALIGN: center; BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH>Sheet1</TH></TR></TD></THEAD><TBODY></TBODY></TABLE>

<TABLE style="BORDER-BOTTOM: black 2px solid; BORDER-LEFT: black 2px solid; PADDING-BOTTOM: 0.4em; BACKGROUND-COLOR: #ffffff; PADDING-LEFT: 0.4em; PADDING-RIGHT: 0.4em; BORDER-COLLAPSE: collapse; BORDER-TOP: black 2px solid; BORDER-RIGHT: black 2px solid; PADDING-TOP: 0.4em" rules=all cellPadding=2 width="85%"><TBODY><TR><TD style="PADDING-BOTTOM: 6px; PADDING-LEFT: 6px; PADDING-RIGHT: 6px; PADDING-TOP: 6px">Worksheet Formulas<TABLE style="BORDER-BOTTOM: #a6aab6 1px solid; TEXT-ALIGN: center; BORDER-LEFT: #a6aab6 1px solid; BACKGROUND-COLOR: #ffffff; BORDER-COLLAPSE: collapse; BORDER-TOP: #a6aab6 1px solid; BORDER-RIGHT: #a6aab6 1px solid" rules=all cellPadding=2 width="100%"><THEAD><TR style="BACKGROUND-COLOR: #e0e0f0; COLOR: #161120"><TH width=10>Cell</TH><TH style="TEXT-ALIGN: left; PADDING-LEFT: 5px">Formula</TH></TR></THEAD><TBODY><TR><TH style="BACKGROUND-COLOR: #e0e0f0; COLOR: #161120" width=10>B1</TH><TD style="TEXT-ALIGN: left">=9.99E+307>A1</TD></TR><TR><TH style="BACKGROUND-COLOR: #e0e0f0; COLOR: #161120" width=10>C1</TH><TD style="TEXT-ALIGN: left">=LOOKUP(9.99E+307,A1:A5)</TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>


Since dates are just simply serial numbers formatted to show something different, dates are, in reality, a number. And since it is a number, we can use this LOOKUP method to find the last numerical value (keep in mind that if your last values are 0, 0 is a number, and it will look at these too).

Likewise, if your data is text you can use "zzzzzz" (or Rept("z",255)) to find the last text value in a range.

Hope this explanation helps!
 
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