This tutorial will demonstrate how to add (or subtract) days to a date in Excel and Google Sheets.

Add Days to Date Main Function

Add Days to a Date

Dates in Excel are stored as serial numbers where each whole number represents a unique day:

DATE Serial number

This makes adding or subtracting dates extremely easy.  Simply add a number of days directly to the date:

=B3+C3

Add Dates

Subtract Days From a Date

Of course, you can subtract days in the same way:

=B3-C3

subtract days

Add Business Days to a Date

Excel also provides you with functions to work with Business Days. Specifically the WORKDAY Function allows you to add business days to a date:

=WORKDAY(B3,C3)

Add Workday

Subtract Working Days

Or you can subtract working days the same way:

=WORKDAY(B3,-C3)

subtract Workday

Adding Days in Google Sheets

The above examples work exactly the same in Google Sheets as in Excel:

Add Days to Date Google Sheet