Currently it's not possible to search items by values of date statement. See https://www.wikidata.org/w/index.php?title=Wikidata:Project_chat&oldid=1054523797#A_form_interface_to_run_some_basic_queries,_particularly_people_searches???
Expected:
You may find https://www.wikidata.org/wiki/Q2484851 by the following search terms:
- William Dawson 1990
- William Dawson 1990-05
- William Dawson 1990-05-02
- William Dawson haswbstatement:P570=1990
- William Dawson haswbstatement:P570=1990-05
- William Dawson haswbstatement:P570=1990-05-02
Optional but nice to have:
- Search by dmy and mdy format
- Search using name of month and abbreviation (November, Nov)
- Search using no leading zero (1990-5-2)
- Search using alternative seperator (1990.5.2, 1990/5/2)
- I18n in searchs