Question: when did the usa start using daylight savings time
[{'answer': 'January 20 , 1942', 'provenance': [{'wikipedia_id': '480675', 'title': 'History of time in the United States', 'start_paragraph_id': 9, 'start_character': 71, 'end_paragraph_id': 9, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::War Time 1918 and 1942.\n'}]}, {'provenance': [{'wikipedia_id': '480675', 'title': 'History of time in the United States', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 574, 'bleu_score': 0.9804854598160591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5194541637922887197}, 'section': 'Section::::War Time 1918 and 1942.\n'}]}]