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How to quickly count appearance in every 15 minutes in Excel?

Here is a list of time about the calling records in a sheet. In this case, I want to count the times of the calling records in every 15 minutes as below screenshot shown, do you have any good idea?
doc count every 15 minutes 1

Count times every 15 minutes with formula and Pivot Table

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Count times every 15 minutes with formula and Pivot Table

To count the times of records in every 15 minutes, you need to use some formulas first and then create a PivotTable.

1. Firstly, you need to calculate the total number of quarters in a day. You can create a range of cells as following screenshot shown, and type formula =B2 *C2 0r directly type =24*4 in cell D2, type =1/D2 or = 1/96 in cell E2.
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2. Then select a blank cell next to the data of time, type this formula =INT(A4/$E$2)*$E$2, E2 is the cell that you use formula =1/96 in above step. See screenshot:
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3. Drag Autofill handle down to apply this formula to the other cells. See screenshot:
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4. In the next column, column C, type 1 into the cells beside the formulas. See screenshot:
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5. Select the range including headers, and click Insert > PivotTable. See screenshot:
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6. In the Create PivotTable dialog, choose to place the Pivot Table in a new sheet or existing sheet. See screenshot:
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7. Click OK, and then in the PivotTable Fields pane, add a When column (the formulas column) to ROWS list and add Count column (the number 1 column) to VALUES list. See screenshot:
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Now the times of callings have been counted out in every 15 minutes.
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