Help!!! I need help with a conditional formatting formula that will:

Column G is all dates

For all of column G, if date is today plus no more than 7 days then, I choose a color:

+

For all of column G, if date is today and more than 8 days but no more than 14 days, then I choose another color:

+

For all of column G, if date is today and more than 15 days, then I choose a 3rd color