New Form Control Current Date Plus 7

This is to test the following;

• Set the date picker to display current date + X days ie its the 1st Feb today so the start date should show as 7 days from now which is 8th Feb
• Set the end date based on number of days from start date ie user can only suspend for 84 days from current date + 7 - this should only let me select up until 3rd May 

Advanced start date = 7
Day range = 84