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How to add or subtract hours from a date/time field in Excel?

This article aims to show you methods of adding or subtracting hours from a date/time field in Excel. Please do as follows.

Add or subtract hours from a date/time field with formulas

Add or subtract hours from a date/time field with Kutools for Excel


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Kutools for Excel's Add Dates / Hours / Minutes formulas can help you quickly add number of dates, hours or minutes to a date in Excel. See screenshot: Download the full feature 60-day free trail of Kutools for Excel now!

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Add or subtract hours from a date/time field with formulas

You can apply the following formulas to add or subtract hours from a date/time field in Excel.

Add hours to a date/time field

If you want to add 12 hours to a date/time field as below screenshot, you can apply the following formula.

doc subtract hours 1

1. Select a blank cell says cell C2, enter formula =A2+12/24 into the formula bar, and then press the Enter key.

doc subtract hours 1

Note: In the formula, A2 contains the date/time field, 12 is the hours you need to add to the date/time field. You can change them based on your need.

Then you will get the final date and time after adding certain hours to a date/time field.

Subtract hours from a date/time field

For subtracting 12 hours from a date/time field, you can apply this formula =A2-12/24. See screenshot:

doc subtract hours 1


Add or subtract hours from a date/time field with Kutools for Excel

If you don’t remember the formulas, Kutools for Excel’s Add hours to date function will help you easily add or subtract hours from a date/time field.

Kutools for Excel : with more than 300 handy Excel add-ins, free to try with no limitation in 60 days. 

1. Select a blank cell for locating the result, then click Kutools > Formulas > Add hours to date. See screenshot:

doc subtract hours 1

2. In the Formula Helper dialog box, you need to:

doc subtract hours 1







(1) In the Date Time box, click the button to select the cell which contains the date/time field.

(2) In the Number box, just enter the number of hours you need to add.

Click the OK button.

Note: For subtracting 12 hours, please enter -12 into the Number box. See screenshot:

doc subtract hours 1

After clicking the OK button, you will get a new time in the selected cell. Then you should change the cell format to the date and time format as you need.

Tip.If you want to have a free trial of this utility, please go to download the software freely first, and then go to apply the operation according above steps.


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