Find difference between two dates and build a calendar

I am trying to build something out formulaically which will find the difference between two dates (Start and End), and then distribute it out into a 12-month calendar.
For example, with a Start date of 1/23/2019 and an End date of 4/1/2019, the difference is 68 days. I have 12 columns to the left each representing a month. Is there
a way to build a formula that runs down 12 columns dispersing the count of 68 days throughout until the End date? So there would be 8 days in Jan-19, 28 days in Feb-19,
31 days in March-19 and then 1 day in April-19.

It would be easier to help if a manually produced sample was provided, however attached is my interpretation of what you want.
The 12 columns are filled with the dates of the 12 months for 2019
Start and End dates are in N2:N3
The following conditional formatting rule is applied to the dates in the 12 columns: =AND(A1>=$N$2,A1<=$N$3,A1<>"")
Let us know if you have any questions.

This thread appears to be a duplicate of this one.

Or am I missing something?

One day I will learn to check and see if the OP has started another (duplicate) thread before I invest time.
I hope that you have a blessed day.