How to use the EOMONTH function in Google Sheets

“The ‘end of month’ is the value that the EOMONTH function in Google Sheets finds. Knowing how to use this function is essential for many businesses, as the end of the month is a time when there are many invoices issued and invoices due for payment.

In this guide, through examples, Quantrimang.com will help readers explore how to use the EOMONTH function in Google Sheets. Finally, you should understand the core concepts that you need for the EOMONTH function.”

What is the EOMONTH function? When should you use it?

In Google Sheets, the EOMONTH function is a built-in function categorized under the Date functions. The EOMONTH function is primarily used to find the last day of the nth month in the past or future. Essentially, the EOMONTH function in Google Sheets provides a date that includes the end of the current month, the current month, and n months in the future.

If you’re quickly adding the current date and time to a spreadsheet, EOMONTH can make invoicing easier. You can use the EOMONTH function to determine dates falling on the last day of the month for purposes such as due dates, expiration dates, and other important financial dates.

Negative values can be used to find dates in the past, while positive values can find dates in the future. It can also be useful for calculating date differences between months instead of specific dates.

Points to note:
  • Any day of the first month can be the start date. As long as the month numbers are the same, the EOMONTH function will provide the same result whether you input “3/5/2022” or “2/25/2022” as the start date (in the format dd/mm/yyyy).
  • If you use decimal numbers, the answer for the subsequent month will be truncated instead of rounded. For example, the function will convert 5.7 to 5 instead of 6.

The syntax of the EOMONTH function is as follows:

=EOMONTH (start_date, months)

Now, let’s take a closer look at each phrase to understand their meanings:

= Equals sign: In Google Sheets, the start of every function is represented by an equals sign (=), indicating to Google Sheets that the cell contains a calculation to be performed.
EOMONTH(): This is the function name that tells Google Sheets which type of calculation will be performed.
start_date: This is an optional parameter. It represents the date that serves as the start date.
months: A required argument. This represents the number of months before or after the start date. Positive numbers indicate future dates, while negative numbers represent past dates.

Using the EOMONTH function in Google Sheets

Calculating the last day of the month is a simple task in Google Sheets thanks to the EOMONTH function. It’s important to note that this function takes leap years into account.

Here is an illustration of each step. The spreadsheet already has columns for the start date and month in this example. Please note the date format used in the example, dd/mm/yyyy.

  1. Click on the empty cell where you want the result to be displayed.
  2. Enter the first part of the formula:
=EOMONTH(
  1. The date that the EOMONTH function will use to determine the last day of a month, in this case, 12/3/2022, should be included after the opening parenthesis. Since the date is already in a cell, we can use a cell reference instead of entering the start date. The example will add A2 and a comma.
  2. The second input is the number of months to add or subtract from your start date. This is located in cell B2 in the sample example. When finished, include a closing parenthesis.
  3. When you press Enter or Return, your formula will automatically calculate, and the function will return the desired date in cell C2.

The formula will return the last day of the month “n” months from your start date, as shown in the example above. When a positive number is used instead of the “months” parameter, the function will add that number of months. Conversely, a negative value for the “months” parameter will return the value of the previous month.

This article covers all the basic knowledge to use the EOMONTH function in Google Sheets. From here, you will need to further explore nested formulas to combine the EOMONTH function with other functions. There are also many other useful date and time calculations that you can perform in this powerful spreadsheet program that you may consider learning next.

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