Number of Days in each month between two dates

Hi,

I am trying to write a formula that will show how many days for each month makes up a total date difference.

For example, in cell A I have a start date, for example Jan 30 2015.

In Cell B I have an End date, for example February 19.

So in total, there are 20 days (End - Start).

What I want to show is January made up 1 of those 20 days, and February made up 19 of those days, March made up 0 of those days, April make up 0 of those days, May made up 0 of those days, etc.

The formula I used for M1 Value (it should technically be M2 (month 2 for February) is:
=IF(DAY(E186)<=28,V186,DAY(E186))

But I am wondering if this is the right "way" to go about this?