This formula works!!! However, I need to add more to the formula with this concept: Let's say there are 2 columns, one column contains start date and 2nd columns contains end date, answers will go to 2 columns if for example: start date column has "7/20/2013", then end date has "8/4"/2013", the July column should have 1 as value and August should have 1 value for having value on end date for august. If both start date and end date falls within same month then the value in zugust should be "0". I need help with the formula. Thanks.