Need formula to calculate days in each month across multiple Start and End dates

Another Senior Moment, I'm afraid!

Attached has four entries with Start and End dates, some of which span more than one month.

Can't remember formula to "break and combine" the days between the relevant months to create table as shown in Cols H - J

(E.g. Row 3 is 24 days between 14/02 - 09/03, 9 of which are in March. Row 5 then has 8 days between 14 - 21/03, so formula needs to identify the March total should be 17 days)

All suggestions, pointers and solutions received gratefully as ever.

Ochimus
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