Count overlapping months from date ranges

jasonnj1978pwest

New Member
Joined
Oct 18, 2017
Messages
10
Hi everyone,

Longtime browser of site and this is my first post!!

So I've been struggling with finding a formula that will help me count how many months are overlapping between more than 2 date ranges. Below is a sample of that data I am working with.


I was able to find a formula that would tell me what date spans were overlapping:
Cell H2: =IF(SUMPRODUCT(--(A:A=A2)*--(F:F<G2)*--(G:G>F2))>1,"Overlapping","")

I thought I could use that to then use a formula that would evaluate all the dates and tell me how many months of overlap there are. In this example I would expect 9 months of overlap.

If anyone can help with this I'd greatly appreciate it!!
 

Excel Facts

Test for Multiple Conditions in IF?
Use AND(test, test, test, test) or OR(test, test, test, ...) as the logical_test argument of IF.
How do you want to handle partial months? if the overlapping time is from March 20th to June 10th, do you want to see 4 months overlap to include each partial month as a full month or do you want to see 2 for only full partial months? Are you only evaluating 2 date ranges?
 
Upvote 0
Thank you for the reply aaronbens.

Here are the answers to your questions:

1. If there is 1 day or greater overlap then round up to consider it 1 month. I'd want to see 4 months in your example.
2. There are 2 date ranges, an eff_date column and and end_date column. There are several rows of date spans for each unique person_id in my data and the data is sorted by that unique person_id and then by the end_date in ascending order i.e., oldest end date to newest end date.

I tried to post a picture of a small data set example and to attach an excel file of that but I don't have permissions for attachements.
 
Upvote 0
So unique person#1 could have 5 or 10 date ranges listed? If so, you want the sum of the overlap of all the ranges?
 
Upvote 0
[TABLE="class: grid, width: 500, align: left"]
<tbody>[TR]
[TD][/TD]
[TD]A[/TD]
[TD]B[/TD]
[TD]C[/TD]
[TD]D[/TD]
[TD]E[/TD]
[TD]F[/TD]
[TD]G[/TD]
[TD]H[/TD]
[/TR]
[TR]
[TD]1[/TD]
[TD]PRIMARY_ID[/TD]
[TD]ID_1[/TD]
[TD]ID_2[/TD]
[TD]FIRSTNAME[/TD]
[TD]LASTNAME[/TD]
[TD]EFF_DATE[/TD]
[TD]END_DATE[/TD]
[TD]OVERLAPPING[/TD]
[/TR]
[TR]
[TD]2[/TD]
[TD]01234567[/TD]
[TD]76543210[/TD]
[TD]01234567[/TD]
[TD]JANE[/TD]
[TD]DOE[/TD]
[TD]11/1/2013[/TD]
[TD]11/30/2013[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]3[/TD]
[TD]01234567[/TD]
[TD]01234567[/TD]
[TD]76543210[/TD]
[TD]JANE[/TD]
[TD]DOE[/TD]
[TD]9/1/2014[/TD]
[TD]3/31/2015[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]4[/TD]
[TD]01234567[/TD]
[TD]76543210[/TD]
[TD]01234567[/TD]
[TD]JANE[/TD]
[TD]DOE[/TD]
[TD]3/1/2016[/TD]
[TD]4/30/2016[/TD]
[TD][/TD]
[/TR]
[TR]
[TD]5[/TD]
[TD]01234567[/TD]
[TD]01234567[/TD]
[TD]76543210[/TD]
[TD]JANE[/TD]
[TD]DOE[/TD]
[TD]1/1/2017[/TD]
[TD]2/28/2017[/TD]
[TD]YES[/TD]
[/TR]
[TR]
[TD]6[/TD]
[TD]01234567[/TD]
[TD]01234567[/TD]
[TD]76543210[/TD]
[TD]JANE[/TD]
[TD]DOE[/TD]
[TD]3/1/2017[/TD]
[TD]9/30/2017[/TD]
[TD]YES[/TD]
[/TR]
[TR]
[TD]7[/TD]
[TD]01234567[/TD]
[TD]76543210[/TD]
[TD]01234567[/TD]
[TD]JANE[/TD]
[TD]DOE[/TD]
[TD]5/1/2016[/TD]
[TD]10/31/2017[/TD]
[TD]YES[/TD]
[/TR]
</tbody>[/TABLE]

****** id="cke_pastebin" style="position: absolute; top: 84px; width: 1px; height: 1px; overflow: hidden; left: -1000px;">[TABLE="class: grid, width: 500, align: left"]
<tbody>[TR]
[TD]01234567[/TD]
[/TR]
</tbody>[/TABLE]
</body>












Sample data of what I'm working with.
 
Upvote 0
Sorry for all the questions. You said you would expect 9 months of overlap, but I only see the last 2 rows as having any overlap and I count 5 months (May, June, July, August, September). Row 5 ends the day before row 6 starts. Am I reading it wrong?
 
Last edited:
Upvote 0

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