This is very useful in creating an invoice, in which case, you usually
create an invoice for the last month.

So, given today Arpil 1, 2009, how to get March 1, 2009 and March 31,
2009

Suppose I have 04/01/2009 in A3

I have been able to find the first date of March through this in for
example F8.

= TEXT(DATE(YEAR(A3), MONTH(A3)-1, 1), "mm/dd/yyyy")

Now, how do I find the last date of the previous month?

Thank you.