Here are a couple of ways, using Class::Date] 
sub dayslastmonth
{
   use Class::Date qw(date now);
   my $date  = now;
   my $first = new Class::Date {year=>$date->year, month=>$date->month
+, day=>1};
   my $last  = $first - '0-0-1';
   return $last->day;
}

[download]
and Date::Calc 
sub dayslastmonth
{
   use Date::Calc qw(Today Days_in_Month);
   my ($year, $month, $day) = Today();
   return Days_in_Month($year,$month - 1);
}

[download]
Class::Date is more object-oriented, but both have similar functionality.

In reply to Re: How to generate a report for last month by Brovnik
in thread How to generate a report for last month by renpai

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