Here is the current code which is not working

Public Function LastDayInLastMo(TargDate As Date) As Date
'get the last day of the month prior to the date in the cell
Dim targMo As Integer
Dim targYr As Integer
Dim tempdate As Date

targMo = Month(TargDate) - 1
targYr = Year(TargDate)
tempdate = DateValue(TargDate)
tempdate = CDate(CStr(targMo) & ", " & CStr(0) & ", " & CStr(targYr))
LastDayInLastMo = tempdate
End Function

"Sam Wilson" wrote:

Parse into year, month & the number 1 then take a day off - otherwise a 30
day month after a 31 day month will cause you problems etc...

=DATE(YEAR(A1),MONTH(A1),1)-1


"thomas donino" wrote:

I am having trouble writing a function that returns the last day of the month
prior to the month from the date in the cell.

I am parsing the date apart into 3 variables, year,date,month
subtracting 1 from month
where i am having trouble is how to put it back together

thank you