How to split the time between two dates over daily columns - excel

Question

I am in much need of help please.
I have the table below.
It has about 300 rows and columns on the right for each day of the year starting 2015, ending 2019. I only entered a few columns here as an example.
What I need:
A formula to split the time (it can be hours or decimal days, it doesn't matter) between the two days on the left on the columns to the right.
In the rest of the days, which are not included in the period, I need a zero in those columns.
I manually entered the results I need so it can help you understand.
E.g.
On the first row:
The employee has spent
15 hours at destination in the first day of travel,
24 hours in the second day of travel
11:50 hours in the last day of travel.
All the rest of the columns to the right, which are not here, starting 1/4/2015 23:59 should give the result zero.
Thank You!!
Entry Date Exit Date 1/1/2015 23:59 1/2/2015 23:59 1/3/2015 23:59
1/1/15 9:00 1/3/15 11:50 15.00 24.00 11.50

Answer 1

As far as I can tell, it boils down to this
1.0 days 2.0 days 3.0 days 4.0 days
period=p in h/d.d p-(1-(so far)) p-(2-(so far)) p-(3-(so far)) 0
EDIT 2: I've come up with a formula.
NOTE:
This formula assumes existence of a column that specifies 0 hours of work between the "end date/time" column ("B") and first work hour ("D"), so you have it like this:
A B C D E F G H
1 Entry Date Exit Date ZERO 1/1/2015 23:59 1/2/2015 23:59 1/3/2015 23:59 1/4/2015 23:59 1/5/2015 23:59
2 1/1/15 9:00 1/3/2015 11:50 0 0.6243055556 1 0.49375 0 0.00
3
The extra column is there to avoid circular dependencies, since
we must "iteratively" accumulate the hours
The main formula for row 2 from column D being:
=MIN(D1-$A2,MIN(MAX(($B2-$A2) - SUM($C2:C2), 0),1))
Note: semicolons may be needed instead of commas in Excel as delimiters.
Note: the last digit in the formula depends on the unit. Here it is in days decimal. If hours, put 24.
In plain English, for a cell
Calculate sum of hours/days decimal in the range C to wherever - 1
Subtract result from the difference between start and end (total hours)
If less than 0, put 0 (MAX(x, 0))
If more than 1, put 1 (MIN(x, 1))
Choose between the result, or the difference between current date and start time, if it is smaller