Question: When does the champions league group stage start?
qaPairs: question: When does the 2017-2018 champions league group stage start?
answer: 12 September 2017
question: When does the 2016-2017 champions league group stage start?
answer: 13 September 2016
question: When does the 2015-2016 champions league group stage start?
answer: 15 September 2015
qaPairs: question: When did the 2017-18 UEFA Champions League group stage start?
answer: 12 September 2017
question: When did the 2016-17 UEFA Champions League group stage start?
answer: 13 September 2016
question: When did the 2015-16 UEFA Champions League group stage start?
answer: 15 September 2015