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

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.

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

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:

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

Here recommend the Add hours to date utility of Kutools for Excel. This feature helps to easily add or subtract hours from a date/time with clicks only.

1. Select a blank cell for locating the result, then click Kutools > Formula Helper > Formula Helper. See screenshot:

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

• In the Choose a formula box, select Add hours to date.
  Tips: You can check the Filter box, type in the keyword to filter the certian formula as you need.
• In the Date Time box, select the cell containing the date time you will add or subtract hours from.
• In the Number box, enter the number of hours you want to add or substract. 
  Tips: For subtracting hours, please enter a negative number into the Number box.
• Click the OK button.

Now the result is populated into the selected cell, please change the cell format to date and time format as you need.

Related articles:

• How to add number of business/working days or hours to a date in Excel?
• How to convert birthdate to age quickly in Excel?

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