How to Use VBA EoMonth Function Efficiently in 3 Minutes (Excel)

Written by Kasper Langmann

The VBA EoMonth function is a powerful tool in Excel that allows you to manipulate and work with dates in a variety of ways. This function, which stands for “End of Month,” can be used to return the last day of the month for any given date. Whether you’re a seasoned Excel user or a beginner just getting started, understanding how to use the EoMonth function can significantly enhance your data analysis and reporting capabilities.

Understanding the VBA EoMonth Function

The VBA EoMonth function is a built-in function in Excel that is categorized as a Date/Time Function. It can be used as a VBA function (VBA) in Excel. As a VBA function, you can use this function in macro code that is entered through the Microsoft Visual Basic Editor.

The syntax for the EoMonth function in VBA is: EoMonth (start_date, months). The function uses two arguments: ‘start_date’ (required) – the initial date used for calculation, and ‘months’ (required) – the number of months before or after start_date.

Benefits of Using the EoMonth Function

There are several benefits to using the EoMonth function in Excel. One of the main advantages is its ability to quickly and accurately calculate the end date of a given month. This can be particularly useful in financial and business analysis, where determining the end of a fiscal period is often necessary.

Another benefit of the EoMonth function is its flexibility. The function can be used to calculate the end date of a month several months in the future or in the past. This makes it a versatile tool for a wide range of date-related calculations.

How to Use the EoMonth Function

Step 1: Open VBA

First, you’ll need to open the Visual Basic for Applications (VBA) editor. To do this, go to the Developer tab on the Excel ribbon and click on the Visual Basic button. If you don’t see the Developer tab, you’ll need to enable it in the Excel Options menu.

Once the VBA editor is open, you can start writing your code.

Step 2: Write the Code

Next, you’ll need to write the code for the EoMonth function. Remember, the syntax for this function is EoMonth (start_date, months). You’ll need to replace ‘start_date’ with the date you want to use for the calculation, and ‘months’ with the number of months before or after the start date.

For example, if you wanted to find the last day of the month six months after January 1, 2022, your code would look like this: EoMonth (“01/01/2022”, 6).

Step 3: Run the Code

Once you’ve written your code, you can run it by pressing F5 or clicking on the Run button in the VBA editor. The function will then calculate the end date of the month based on the parameters you’ve set.

If your code is written correctly, you should see the correct end date displayed in the VBA editor.

Troubleshooting Common Errors

While the EoMonth function is relatively straightforward, there are a few common errors that you might encounter. One of the most common is a Type Mismatch error, which occurs when the ‘start_date’ or ‘months’ arguments are not the correct data type.

To avoid this error, make sure that your ‘start_date’ is a valid date and that ‘months’ is a numerical value. If you’re still encountering errors, check to make sure that your date is formatted correctly. Excel may not recognize dates that are written in a non-standard format.

Advanced Uses of the EoMonth Function

While the basic use of the EoMonth function is to calculate the end date of a given month, there are several more advanced ways to use this function. For example, you can use the EoMonth function in conjunction with other Excel functions to create more complex date calculations.

One advanced use of the EoMonth function is to calculate the number of days between two dates. To do this, you would use the EoMonth function to find the end date of the start date’s month, then subtract the start date from this end date to find the number of days in between.


The EoMonth function is a powerful tool in Excel that can greatly enhance your ability to work with dates. Whether you’re calculating the end of a fiscal period, determining the number of days between two dates, or just need to find the last day of a month, the EoMonth function can help. With a little practice, you’ll be able to use this function efficiently and effectively in your Excel work.