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Hi,<br />
<br />
Check in attached...do you mean like this? Else please upload a dummy/sample workbook.<br />
<a href="https://filedb.experts-exchange.com/incoming/2018/06_w26/1345136/Tommyo94_CountIFS.xlsx" target="_blank" class="file-inline" title="CountIFS (11 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Tommyo94_CountIFS.xlsx</a>
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Hi,

Check in attached...do you mean like this? Else please upload a dummy/sample workbook.
Tommyo94_CountIFS.xlsx [https://filedb.experts-exchange.com/incoming/2018/06_w26/1345136/Tommyo94_CountIFS.xlsx]

Tommyo94_CountIFS.xlsx

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Attached is a sample. &nbsp;Not looking for the count of units but the count of overlapping times.<br />
<a href="https://filedb.experts-exchange.com/incoming/2018/06_w26/1345290/Sample-of-Overlapping-Units.xlsx" target="_blank" class="file-inline" title="Sample-of-Overlapping-Units.xlsx (12 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>Sample-of-Overlapping-Units.xlsx</a>
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Attached is a sample.  Not looking for the count of units but the count of overlapping times.
Sample-of-Overlapping-Units.xlsx [https://filedb.experts-exchange.com/incoming/2018/06_w26/1345290/Sample-of-Overlapping-Units.xlsx]

Sample-of-Overlapping-Units.xlsx

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In Excel I need to be able to compute the number of times there are more than one unit on an incident and how many units end up on that incident. &nbsp;I have start and end (date/time) in separate columns. &nbsp;I'm guessing an array of some kind but not sure how to determine number of units on an incident
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In Excel I need to be able to compute the number of times there are more than one unit on an incident and how many units end up on that incident.  I have start and end (date/time) in separate columns.  I'm guessing an array of some kind but not sure how to determine number of units on an incident

Counting overlapping date/time

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A spreadsheet is an interactive computer application program for organization, analysis and storage of data in tabular form. Spreadsheets developed as computerized simulations of paper accounting worksheets. The program operates on data represented as cells of an array, organized in rows and columns. Each cell of the array may contain either numeric or text data, or the results of formulas that automatically calculate and display a value based on the contents of other cells.