1. In one row. i.e. in row 1, how many of the dates are within 30 days of each other? in row 2, how many of the dates are within 30 days of each other?

Row 1: 30/09/2016 24/08/2016 10/08/2016 20/07/2016 22/06/2016 8/06/2016 25/05/2016 27/04/2016 13/04/2016 30/03/2016
Row 2: 27/06/2016 13/06/2016 30/05/2016 16/05/2016 2/05/2016 18/04/2016 4/04/2016 14/03/2016 29/02/2016 16/02/2016

2. In one row. i.e. in row 1, what is the minimum number of days between 2 dates? in row 2, what is the minimum number of days between 2 dates?

3. Yes to the second, but regarding the first, "How many within x Days: y"