#! /usr/bin/perl -w
use strict;
use Date::Calc qw/Days_in_Month/;
while( <DATA> ) {
chomp;
my( $year, $month ) = split;
my $days = eval { Days_in_Month( $year, $month) };
$days = 'who knows?' if $@;
print "$year/$month => $days\n";
}
__DATA__
1996 1
1996 2
1998 2
2000 2
1900 2
1600 2
2001 2
2001 7
2001 12
2001 13
2001 0
hint: if you know your data are clean then you can omit the eval and error check.
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