ThreeTen/threeten — pull request #79 by RogerRiggs (2012-09-05 14:56:09+00:00)
Title: #19 multi-unit Period; added LocalPeriod class plus tests

Implement multi-unit Period to match the existing single unit Period.
Includes of(Period), plus(Period), minus(Period) and between methods for DateTime.
Simplifies API to meet the requirements to be able to store an SQL date.