Question: When does the champions league group stage start?
Disambiguated questions and answers: question: When does the 2017-2018 champions league group stage start?
When does the 2016-2017 champions league group stage start?
When does the 2015-2016 champions league group stage start?
answer: 12 September 2017
13 September 2016
15 September 2015
question: When did the 2017-18 UEFA Champions League group stage start?
When did the 2016-17 UEFA Champions League group stage start?
When did the 2015-16 UEFA Champions League group stage start?
answer: 12 September 2017
13 September 2016
15 September 2015
Natural Questions answer: 12 -- 13 September 2017 (from the Wikipedia article "2017–18 UEFA Champions League")