Email alert and reporting tool

[Navya08]

Can someone help me to achieve two things :

1) i have a dataset where i want to highlight circular name where circular close date is  not within 15days of  circular issue date.

(Circular close date should be within 15 days of circular issue date)

2) i want to create an email alert for the same workflow where 15days is crossed and prior to that one email alert to update that deadline is about to breach . Eg: 13th day i should receive an alert to say please close the circular. 
and if its still not done the 16th day it will be sent to the team lead stating defaulter .

i have attached data set for the refernce

[Navya08]

 Circular close date should be within 15 days of circular issue date