Column 2 =
SWITCH(TRUE(),
Dates[Date]>01/01/2007 && Dates[Date]<08/30/2008,"2007/2008",
Dates[Date]>08/31/2008 && Dates[Date]<08/30/2009,"2008/2009",
Dates[Date]>08/31/2009 && Dates[Date]<08/30/2010,"2009/2010",
Dates[Date]>08/31/2010 && Dates[Date]<08/30/2011,"2010/2011",
Dates[Date]>08/31/2011 && Dates[Date]<08/30/2012,"2011/2012",
Dates[Date]>08/31/2012 && Dates[Date]<08/30/2013,"2012/2013",
Dates[Date]>08/31/2013 && Dates[Date]<08/30/2014,"2013/2014",
Dates[Date]>08/31/2014 && Dates[Date]<08/30/2015,"2014/2015",
Dates[Date]>08/31/2015 && Dates[Date]<08/30/2016,"2015/2016",
Dates[Date]>08/31/2016 && Dates[Date]<08/30/2017,"2016/2017",
"Unaccounted")