To install DateTime::Duration::Patch::StringifyAsISO8601, copy and paste the appropriate command in to your terminal.
cpanm
cpanm DateTime::Duration::Patch::StringifyAsISO8601
CPAN shell
perl -MCPAN -e shell
install DateTime::Duration::Patch::StringifyAsISO8601
For more information on module installation, please visit the detailed CPAN module installation guide.