I should probably add that you can get a bit more information from both the Perl6 Advent Calendar here http://perl6advent.wordpress.com/2010/12/16/day-16-time-in-perl6/ or the docs for a related class Date here http://doc.perl6.org/type/Date

There are also several extensions to DateTime in the module ecosystem to deal with additional date formats and standards, you can check these out here: http://modules.perl6.org/