slackbuilds_ponce/libraries/perl-DateTime-Format-ISO8601
..
perl-DateTime-Format-ISO8601.info
perl-DateTime-Format-ISO8601.SlackBuild
README
slack-desc

perl-DateTime-Format-ISO8601 parses almost all ISO8601 date and time formats.
ISO8601 time-intervals will be supported in a later release.

This requires perl-DateTime, perl-Datetime-Format-Builder.