#perl
use strict;
use Date::Calc qw( Delta_Days Today Days_in_Month
Add_Delta_Days); # add Add_Delta_Days

my ($y,$m,$d) = Today();

# Add_Delta_Days
#($year,$month,$day) = Add_Delta_Days($year,$month,$day,$Dd);
my $prev_mth_end = sprintf "%04d,%02d,%02d",
                   Add_Delta_Days($y,$m,1,-1);
print $prev_mth_end;