How to quickly sum hourly data to daily in Excel?

For instance, you have a huge worksheet which includes hourly data every day, and what you want to do is to sum 24 values representing the 24 hours of a day to get the daily value as below screenshot shown. Except summing them one by one, are there any quick tricks?
Sum hourly data to daily with PIVOTTABLE
Sum hourly data to daily with Kutools for Excel

Sum hourly data to daily with PIVOTTABLE

To quickly sum data by daily, you can apply PivotTable.

1. Select all the data range and click Insert > PivotTable ( > PivotTable), and in the popping dialog, check the New Worksheet or Existing Worksheet option as you need under Choose where you want the PivotTable report to be placed section. See screenshot:

2. Click OK, and a PivotTable Fields pane pops out, and drag Date and Time label to Rows section, drag Hourly Value to Values section, and a PivotTable has been created. See screenshot:

3. Right click one data under Row Labels in the created PivotTable, and click Group to open Grouping dialog, and select Days from the By pane. See screenshot:

4. Click OK. Now the hourly data has been sum daily. See screenshot:

Tip: If you want to do other calculations to the hourly data, you can go to the Values section and click at arrow-down to select Value Field Settings to change the calculation in the Value Field Settings dialog. See screenshot:

Sum hourly data to daily with Kutools for Excel

If you have Kutools for Excel, the steps on summing hourly data to daily will be much easier with its Advanced Combine Rows utility.

After free installing Kutools for Excel, please do as below:

1. Select the date and time data, and click Home tab, and go to Number group and select Short Date from the drop down list to convert the date and time to date. See screenshot:

2. Select the data range and click Kutools > Merge & Split > Advanced Combine Rows. See screenshot:

3. In the Advanced Combine Rows dialog, select Date and Time column, and click Primary Key to set it as Key, and then click Hourly Value column and go to Calculate list to specify the calculation you want to do. See screenshot:

4. Click Ok. The hourly data has been summed by daily.

Tip: Prevent losing the original data, you can paste one copy before applying Advanced Combine Rows.

Demo