Last Date in Month

[moppenhe]

I have a list of historical stock prices and their corresponding dates and I am trying to calculate quarterly returns. To calculate this I am trying to use a vlookup where the lookup value is = Vlookup(year,month +1,0),.... to return the last day of the month that starts and ends the quarter.

The problem is that there is no data in there for weekends so if the last day of a trading month is 8/29/09, then it returns an #N/A

Anyone have any ideas on how to overcome this? It would be nice if I could have it look up the max day in that given month, but I dont know if this is possible.

Thanks,

MBO

 

[c_m_s_jr]

If you are using 2003 you need to install the Analysis Tool Pack to use this, but maybe:

=VLOOKUP(EOMONTH(A1,0),$D$1:$E$2,2,FALSE)

Where EOMONTH will calculate the last day of the month for the given date in A1. So if A1 = 1/15/2009 it would calculate 1/31/2009

 

[moppenhe]

The problem is that if the data does not have 1/31/2009 in there but cuts of on Friday the 29th of 2009. (I am not actually sure if the 29th of January was a friday but this is just an example to help describe me issue).

 

[c_m_s_jr]

If you can post more information I think that will help. I thought you wanted it to look up the last day of the month.

Your VLOOKUP is not clear on how your data is structured or what you are going after.

 

[VoG]

Try

=DATE(YEAR(A1),MONTH(A1)+1,0)-(MAX(0,WEEKDAY(DATE(YEAR(A1),MONTH(A1)+1,0),2)-5))

From http://www.cpearson.com/excel/DateTimeWS.htm

 

[barry houdini]

If your dates are listed in ascending order then just change your VLOOKUP to use TRUE as 4th argument.....then if the last day of the month doesn't exist in the data it'll find the previous one, i.e. the last date listed for that month.

or if not sorted ascending you can use an array formula to get the latest date in that month

=MAX(IF(Dates< DATE(year,month+1,1),Dates))

confirmed with CTRL+SHIFT+ENTER<DATE(YEAR,MONTH+1,1),DATES))< p>

 

[drsarao]

I think Barry's first solution is spot-on.

Another way would be to see if last date is a Sun/Sat and return last Fri in that case. Vog has given a formula for it I think.

A different formula for the same:

=IF(WEEKDAY(A1,3) > 4,A1+4-WEEKDAY(A1,3),A1)