I'm stuck in a problem that is, I want to calculate number of days between two selected dates from bootstrap `daterangepicker` month wise, i.e.
let us assume that 

```
start date = 07/19/2018 
end date  = 09/28/2018

```

The result should be:

```
number of days in 07 = 13 days
number of days in 08 = 31 days
number of days in 09 = 28 days
total number of days = 72 days

```