Including the Date Range Criteria as part of the Title

I am using LastFullMonth (great function) as part of my criteria for a report, and want to include this data as part of the title - "Bla Bla Report for the Following Dates: mm/dd/yyyy to mm/dd/yyyy". I am sure I will need to create a custom formula, but I can't figue out how to convert the evaluation of LastFullMonth to a string, so that I can concantinate it to the rest of the title.

Much TIA

Jim Cook