Jdouglas added a subscriber: Jdouglas.
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In https://phabricator.wikimedia.org/T90131#1059403, @Smalyshev wrote:

> We may need custom dateTime to represent that dreaded 
> https://www.wikidata.org/wiki/Q1#P580


Yep, it looks like this value doesn't currently export to RDF correctly:

- The //Universe// entity is wdq:Q1 <https://www.wikidata.org/wiki/Q1>
- The //Start Time// property is wdq:P580 
<https://www.wikidata.org/wiki/Property:P580>

  sparql
  prefix wdq: <http://www.wikidata.org/entity/>
  select ?x WHERE {
    wdq:Q1 wdq:P580s ?x
  }



| x                                                                      |
| ---------------------------------------------------------------------- |
| http://www.wikidata.org/entity/Q1S789eef0c-4108-cdda-1a63-505cdd324564 |

This means there exists a statement:

  wdq:Q1 wdq:P580s wdq:Q1S789eef0c-4108-cdda-1a63-505cdd324564

Let's find out about `wdq:Q1S789eef0c-4108-cdda-1a63-505cdd324564`:

  sparql
  prefix wdq: <http://www.wikidata.org/entity/>
  select ?x ?y WHERE {
    wdq:Q1S789eef0c-4108-cdda-1a63-505cdd324564 ?x ?y
  }



| x                                        | y                                  
                               |
| ---------------------------------------- | 
----------------------------------------------------------------- |
| http://www.w3.org/ns/prov#wasDerivedFrom | 
http://www.wikidata.org/entity/Rd7fdd0d3f5ec956ea699679ee7109c9e  |
| http://www.wikidata.org/entity/P459q     | 
http://www.wikidata.org/entity/Q15605                             |
| http://www.wikidata.org/entity/P459q     | 
http://www.wikidata.org/entity/Q76250                             |
| http://www.wikidata.org/entity/P580v     | 
http://www.wikidata.org/entity/VT392fa31586a0bde63ee928c91b586004 |
| http://www.wikidata.org/entity/P805q     | 
http://www.wikidata.org/entity/Q500699                            |
| rdf:type                                 | 
http://www.wikidata.org/ontology#Statement                        |

That value for `P580v` looks interesting. Let's check it out:

  sparql
  prefix wdq: <http://www.wikidata.org/entity/>
  select ?x ?y WHERE {
    wdq:VT392fa31586a0bde63ee928c91b586004 ?x ?y
  }



| x                                                  | y                        
                  |
| -------------------------------------------------- | 
------------------------------------------ |
| http://www.wikidata.org/ontology#preferredCalendar | 
http://www.wikidata.org/entity/Q1985727    |
| http://www.wikidata.org/ontology#time              | 1196                     
                  |
| http://www.wikidata.org/ontology#timePrecision     | 1                        
                  |
| rdf:type                                           | 
http://www.wikidata.org/ontology#TimeValue |

It appears the Universe began in 1196 AD.  That doesn't seem right, considering 
it's listed as 13798 million years BCE <https://www.wikidata.org/wiki/Q1#P580>.


TASK DETAIL
  https://phabricator.wikimedia.org/T90131

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To: Jdouglas
Cc: Jdouglas, Smalyshev, Thompsonbry.systap, daniel, Beebs.systap, Haasepeter, 
Aklapper, Manybubbles, jkroll, Wikidata-bugs, aude, GWicke, JanZerebecki



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