This is Perl module autobox::DateTime::Duration.
INSTALLATION
autobox::DateTime::Duration installation is straightforward. If your CPAN shell is set up, you should just be able to do
% cpan autobox::DateTime::Duration
Download it, unpack it, then build it as per the usual:
% perl Makefile.PL
% make && make test
Then install it:
% make install
DOCUMENTATION
autobox::DateTime::Duration documentation is available as in POD. So you can do:
% perldoc autobox::DateTime::Duration
to read the documentation online with your favorite pager.
Tatsuhiko Miyagawa