use POSIX 'strftime';
my @t = (localtime(time));

my $lastday = POSIX::mktime(0,0,0,0,$t[4],$t[5],0,0,-1);
my $lastday_prev = POSIX::mktime(0,0,0,0,$t[4]-1,$t[5],0,0,-1);
my @ld_prev = localtime($lastday_prev);
my @ld = localtime($lastday);


my $monthly_date_beg = strftime('%m/' . $ld_prev[3] . '/%Y', $t[0],$t[1], $t[2], $t[3], $t[4]-2, $t[5]);
my $monthly_date_end = strftime('%m/' . $ld[3] . '/%Y', $t[0],$t[1], $t[2], $t[3], $t[4]-1, $t[5]);



print "beg = $monthly_date_beg\n";
print "end = $monthly_date_end\n";