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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

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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Count by Color

In some cases, you may have a range of calues with multiple colors, and what you want is to count/sum values based on same color, how can you quickly calculate?
With Kutools for Excel's Count by Color, you can quickly do many calculations by color, and also can generate a report of the calculated result.
doc count by color

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