Some /film/film instances have multiple values under "initial_release_date" property.
An example is Gridlock'd [ http://www.freebase.com/view/guid/9202a8c04000641f800000000086440a ]
Usually there is a full ISO format date (e.g. 1997-01-01] and a year-only date (e.g. 1997).
Is this a bug? The dates do not appear to be tied to a release in a particular country or anything like that.