what is the {point in time} for {Smita Patil} has {award received} as {National Film Award for Best Actress} ?
On what date did Smita Patil receive the National Film Award for Best Actress?
When did Smita Patil receive the National Film Award for Best Actress?
SELECT ?d WHERE { ?n property:point_in_time ?d . ?n property:award_received resource:National_Film_Award_for_Best_Actress . resource:Smita_Patil property:award_received ?n }
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