Or using localtime() (but poj's is probably better):

#!/usr/bin/perl 
use strict;
use warnings;

my $datafile = $ARGV[0];

#get date from localtime
my @date = localtime(time);
my $month = sprintf("%02d", ($date[4] + 1));
my $year = 1900 + $date[5];
my $day = sprintf("%02d", $date[3]);

my %months = ("01", "31", "02", "28", "03", "31", "04", "30", "05", "3
+1", "06", "30", "07", "31", "08", "31", "09", "30", "10", "31", "11",
+ "30", "12", "31");

# in case of leap year
%months = ("01", "31", "02", "29", "03", "31", "04", "30", "05", "31",
+ "06", "30", "07", "31", "08", "31", "09", "30", "10", "31", "11", "3
+0", "12", "31") if $year%4 == 0;

my @array = ();

open (FILE, "<", $datafile);
while (<FILE>)
    {
        @array = split (" ", $_);
        print STDOUT "$_" if ((@array==2)||($array[0] =~ /[a-zA-Z]/));
        print STDOUT "$array[0]\t$year,$month,$months{$day}\n" if ((@a
+rray==1) && ($array[0] !~ /[a-zA-Z]/));
    }
close FILE;
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