use warnings;
use strict;

my $date = "Nov 23 22:31:12 2019 GMT";
print "Input date: $date\n";

{
	use Time::Local qw/timegm_modern/;
	my %MONTH_NAMES = ( Jan=>0, Feb=>1, Mar=>2, Apr=>3, May=>4,
		Jun=>5, Jul=>6, Aug=>7, Sep=>8, Oct=>9, Nov=>10, Dec=>11 );
	my ($mon,$mday,$hour,$minute,$sec,$year) = split /\s+|:/, $date;
	my $tm = timegm_modern($sec,$minute,$hour,$mday,
		$MONTH_NAMES{$mon},$year);
	print "timegm+gmtime: ", gmtime($tm)." GMT\n";
	print "timegm+localtime: ", localtime($tm)." Local\n";
}
# - OR -
{
	use Time::Piece;
	my $tm = Time::Piece->strptime($date, '%b %d %H:%M:%S %Y %Z');
	print "Time::Piece: ", $tm->strftime, "\n";
	print "Time::Piece+localtime: ", localtime($tm->epoch)." Local\n";
}
# - OR -
{
	use DateTime;
	use DateTime::Format::Strptime;
	my $strp = DateTime::Format::Strptime->new(
		pattern => '%b %d %H:%M:%S %Y %Z', on_error => 'croak');
	my $dt = $strp->parse_datetime($date);
	print "DateTime: ",$dt->strftime("%Y-%m-%dT%H:%M:%S%z (%Z)"),"\n";
	$dt->set_time_zone('Asia/Seoul');
	print "DateTime: ",$dt->strftime("%Y-%m-%dT%H:%M:%S%z (%Z)"),"\n";
}