use POSIX qw( strftime );
my $ref = [ 0 .. 2 ];
print($ref, "\n");
printf("%X\n", 0+$ref);
print(strftime('%Y-%m-%d %H:%M:%S', localtime($ref)), "\n");
print(strftime('%Y-%m-%d %H:%M:%S', localtime(0+$ref)), "\n");