= 1.0.2 2010--3-18

* Fixed bug where the effective_at date when implicitly set was not UTC.


= 1.0.1 2009-12-29

* Added call back to populate effective_at with DateTime.now if it is not explicitly set to something else.
* Added presence validation to effective_at.


= 1.0.0 2009-12-26

* Initial release  Ported from another project.