$ perl -le'
use Time::Local qw/ timegm_nocheck /;
my $in_date = q/11004/;
my ( $in_year, $day_of_year ) = $in_date =~ /\A(\d\d|\d\d\d\d)(\d\d\d)
+\z/;
$in_year = ( ( 4 == length $in_year ? "" : "20" ) . $in_year ) - 1900;
my ( $day, $month, $year ) = ( gmtime timegm_nocheck 0, 0, 0, $day_of_
+year, 0, $in_year )[ 3, 4, 5 ];
printf "%d %d %d\n", $year + 1900, $month + 1, $day;
'
2011 1 4
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