A partial date value array still must create a full ISO date or date_create() will not work correctly.

#720868 by dereine and KarenS, Fix argument handling for dates outside allowed range so only page views return 404.

Make sure query_fields is always available, and add some handling for situation where there is no other filter but the date filter to avoid creating invalid SQL.

#993148 Use url() for link to date format page in date widget settings so it works without clean urls.

#983330 Remove deprecated use of views_object_cache_clear and replace it with ctools_object_cache_clear.