Month and Day Between (DATEDIF does not work)

[DinoMania]

Hello! I have been scrounging forums for an answer to my question. I have start and end dates that I need to calculate the complete full calendar month and days between both dates.

The reason datedif does not work is when the start date and end date are not full calendar months but are greater than 30 days making it appear to be a full month. EXAMPLE start date is 7/15 and the end date is 9/20. I would need the formula to give me 1 month (August) and 36 days (17 in July and 19 in September). I have over 20K rows of this with varying dates that cross over a calendar year. The reason I need the exact calender months and partial months in days is that the dollar value attributed to a month compared to days (partial months) is different.

Let me know if you know anything that would help me. Thank you!

 

[Dave Patton]

Excel 2010
	A	B	C	D	E	F	G	H	I	J	K
2	Months	Days	Start	End	Mar-18	Apr-18	May-18	Jun-18	Jul-18	Aug-18	Sep-18
3					31	30	31	30	31	31	30
4	1	37	15-Jul-18	20-Sep-18	0	0	0	0	17	31	20
5	4	1	01-Mar-18	01-Jul-18	31	30	31	30	1	0	0
2dd

Cell Formulas
Range	Formula
A4	=SUMPRODUCT(--($E$3:$N$3=E4:N4))
B4	=SUM(E4:N4)-SUMPRODUCT(--($E$3:$N$3=E4:N4),(E4:N4))
E3	=F2-E2
E4	=MAX(0, MIN(EOMONTH(E$2, 0), $D4) + 1 - MAX(E$2, $C4))
E5	=MAX(0, MIN(EOMONTH(E$2, 0), $D5) + 1 - MAX(E$2, $C5))

Mar-18 etc is 1-Mar-18 i.e. first day of applicable month
Copy the formula down and across as applicable.

 

[DinoMania]

That worked thank you!

 

[Dave Patton]

Thanks for the feedback.