基于hash的sort

http://stackoverflow.com/questions/10987507/sort-dates-in-perl

http://wwwacs.gantep.edu.tr/docs/perl-ebook/ch9.htm#SpecifyingtheSortOrder

http://www.cnblogs.com/xinghua/archive/2007/02/07/643867.html

http://www.tizag.com/perlT/perlhashes.php

and a dedicated module in perl to handle date sort:

http://perldoc.perl.org/Time/Piece.html

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