[Wikidata-bugs] [Maniphest] [Created] T253771: WDQS gives dates that are two days ealier than reported on the item page and the API

[Dipsacus_fullonum]

Dipsacus_fullonum created this task.
Dipsacus_fullonum added a project: Wikidata-Query-Service.
Restricted Application added a subscriber: Aklapper.
Restricted Application added a project: Wikidata.

TASK DESCRIPTION
  This query:
  
    # Query birthdate of Vespasian
    SELECT ?date ?precision ?rank
    WHERE
    {
      wd:Q1419 p:P569 ?dob_statement.
      ?dob_statement wikibase:rank ?rank.
      ?dob_statement psv:P569 ?dob_value.
      ?dob_value wikibase:timePrecision ?precision.
      ?dob_value  wikibase:timeValue ?date.
    }
  
  gives three dates of birth for Q1419 (Vespasian) <https://www.mediawiki.org>. 
Compare with https://www.wikidata.org/wiki/Q1419#P569:
  
  - The preferred date in the query is "15 November 0009", but item page says 
"17. november 9".
  - The deprecated value in the query is "16 November 0009", but the item page 
says "18. november 9".
  
  The API (wbgetclaims: 
https://www.wikidata.org/w/api.php?action=wbgetclaims&entity=Q1419&property=P569)
 agrees with the item page.
  
  So it seems that WDQS gives dates that are two days earlier  than they should 
be in this case.

TASK DETAIL
  https://phabricator.wikimedia.org/T253771

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To: Dipsacus_fullonum
Cc: Dipsacus_fullonum, Aklapper, CBogen, darthmon_wmde, Nandana, Namenlos314, 
Lahi, Gq86, Lucas_Werkmeister_WMDE, GoranSMilovanovic, QZanden, EBjune, merbst, 
LawExplorer, _jensen, rosalieper, Scott_WUaS, Jonas, Xmlizer, jkroll, 
Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Mbch331

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