what is the {start time} for {Mahmoud Abbas} has {position held} as {President of the State of Palestine} ?
Mahmoud Abbas begun his job as the President of the State of Palestine on what date?
When did Mahmoud Abbas begin his job as the President of the State of Palestine?
SELECT ?o WHERE { resource:Mahmoud_Abbas property:position_held ?r . ?r property:start_time ?o . ?r property:position_held resource:President_of_the_State_of_Palestine }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q127998> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P39> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q3911022> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q127998 p:P39 ?s . ?s ps:P39 wd:Q3911022 . ?s pq:P580 ?value}