Corrected the year in this expected date string.
Insert a 'T' in between date and time in week date strings. Fixes two test failures on its own; contributes to fixing most if not all of the others.
Set the NSDateFormatter's timeZone when generating week date strings. Fixes two more failures and probably contributes to fixing at least some of the others.
Fixed time zone separator support in week date strings. Fixes three more failures. One remains.
Fixed the remaining failure: These expected strings were wrong. Back at zero failures!