Concurrent Calls in Excel

[FONT=&quot]I am trying to find a formula to find the number of concurrent calls at one time. My columns contain phone provider, outbound number, inbound number, start date and time (one cell), duration of call, and end date and time (one cell) from A to H in the order they are listed. In this stage of the project, inbound and outbound numbers are not important and aren't necessary to include, nor are the phone providers or the durations. Some of the calls last several days, so that will have to be taken into account. There are almost 20,000 rows in the sheet, so it would be ridiculous to do it manually. I am essentially just looking for how many phone calls are active at one time. If there is a formula that can help me do that, that would be great. I have already tried many =COUNTIFS and =SUMPRODUCT formulas, but they are not giving correct results. This project is due fairly soon, so any answer could be helpful. [/FONT]

[FONT=&quot]Thanks![/FONT]

Firstly, we are happy to help, but please be clear that any help you get is given for free, and the proximity of any deadlines you have will play no part in how quickly you get help here.

Please attach a sample workbook with dummy (desensitised) but realistic data. Mock up manually the results you would like to see.

Off Topic
@AliGW, thank you for your help with my registration @ excelguru.

Welcome!

@Belleke
Welcome
please use PM or visitor messages to send private/off topic messages. I suppose it's the same at Chandoo's.
Tot binnenkort :smile:

@sbcc
Hi and welcome
Please,do not crosspost your question on multiple forums without including links here to the other threads on other forums.

Cross-posting is when you post the same question in other forums on the web. The last thing you want to do is waste people's time working on an issue you have already resolved elsewhere. We prefer that you not cross-post at all, but if you do (and it's unlikely to go unnoticed), you MUST provide a link (copy the url from the address bar in your browser) to the cross-post.

Read this to understand why we ask you to do this, and then please edit your first post to include links to any and all cross-posts in any other forums (not just this site).

Do not post any further responses in this thread until a link has been provided to these cross posts.