Find last months first and last date. (1 Viewer)

[eason]

I've developed a report for a company. In the header they want last months first and last date to print. When finished the report will generate itself on the 5th of each month for last month totals. How do I get last months first and last date to print automaticly in the header? What about leap year in Feb. and how about going from Jan. of one year to Dec. of the previous year?