what is the {point in time} for {Günter Grass} has {award received} as {Princess of Asturias Literary Prize} ?
Give me the date Gunter Grass received the award of Princess of Asturias Literary Prize.
When did Gunter Grass recieved the award of Princess of Asturias Literary Prize?
SELECT ?m WHERE { resource:Günter_Grass property:award_received ?n . ?n property:award_received resource:Princess_of_Asturias_Literary_Prize . ?n property:point_in_time ?m }
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?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P166> .
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} 

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