Question: when did time zones start in the us
[{'answer': 'November 18 , 1883', 'provenance': [{'wikipedia_id': '480675', 'title': 'History of time in the United States', 'start_paragraph_id': 1, 'start_character': 56, 'end_paragraph_id': 1, 'end_character': 74, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '480675', 'title': 'History of time in the United States', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 425, 'bleu_score': 0.9735040436119741, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6734782966681510442}, 'section': 'Section::::Abstract.'}]}]