Date parameter for the first day of previous month
I created a data parameter and I want my date parameter default value to be the first day of previous month, the expression {$FIRST_DAY_OF_MONTH()$} is pointing to the fitst day of current month and when I tried {$FIRST_DAY_OF_MONTH()-1$} it is just subtracting a day(thought to go back one month)...Is there way I can point my default value to first day of previous month.?
Regards
Sri