If you’re a regular user of Google Sheets, you’ve probably used the DAYS function to calculate the number of days between two dates. But did you know that there’s another function called DAYS360 that you can use for a slightly different purpose?

The DAYS360 function is a variation on the DAYS function that is often used in financial calculations. It allows you to calculate the number of days between two dates based on a 360-day year, rather than the actual number of days in the year. This can be useful when you’re working with financial documents that use the 360-day year for calculating interest or other amounts. In this blog post, we’ll take a closer look at the DAYS360 function and how it differs from the DAYS function. We’ll also provide some examples of how you can use it in your own Google Sheets.

Table of Contents

## Definition of DAYS360 Function

In Google Sheets, the DAYS360 function is used to calculate the number of days between two dates based on a 360-day year. This means that the function ignores the actual number of days in the year and treats every month as having 30 days. The syntax for this function is DAYS360(start_date, end_date, [method]), where start_date and end_date are the dates you want to use in the calculation, and method is an optional argument that determines how the function calculates the number of days. The DAYS360 function can be useful for financial calculations that use the 360-day year, such as calculating interest or other amounts.

## Syntax of DAYS360 Function

In Google Sheets, the syntax for the DAYS360 function is

=DAYS360(start_date, end_date, [method])

where start_date is the earlier date and end_date is the later date. The method argument is optional and determines how the function calculates the number of days. If the method argument is not specified, the function uses the US (NASD) method, which treats the start date and end date as follows:

- If the start date or end date is the last day of February, it is treated as if it were the 30th day of that month.
- If the start date or end date is the last day of any other month, it is treated as if it were the 30th day of that month, unless the last day of the month is the 31st, in which case it is treated as if it were the 31st day of that month.

There are two other methods that can be used in the method argument: the European method and the 30E/360 ISDA method. These methods treat the start date and end date differently, so you should choose the appropriate method depending on your specific needs.

## Examples of DAYS360 Function

Here are three examples of how you could use the DAYS360 function in Google Sheets:

- Calculate the number of days between two dates using the US (NASD) method: To do this, you would use the DAYS360 function with the two dates as arguments, like this:
=DAYS360("1/1/2020", "1/10/2020")

This would return the result 9, indicating that there are nine days between the two dates based on a 360-day year.

- Calculate the number of days between two dates using the European method: To do this, you would use the DAYS360 function with the two dates as arguments and specify the European method in the method argument, like this:
=DAYS360("1/1/2020", "1/10/2020", "E")

This would return the result 10, indicating that there are ten days between the two dates based on a 360-day year using the European method.

- Calculate the number of days between two dates using the 30E/360 ISDA method: To do this, you would use the DAYS360 function with the two dates as arguments and specify the 30E/360 ISDA method in the method argument, like this:
=DAYS360("1/1/2020", "1/10/2020", "30E/360 ISDA")

This would return the result 9, indicating that there are nine days between the two dates based on a 360-day year using the 30E/360 ISDA method.

## Use Case of DAYS360 Function

Here are a few examples of how you might use the DAYS360 function in real-life scenarios:

- As a finance professional, you might use the DAYS360 function to calculate the number of days between the dates of two invoices for interest calculation purposes. This could help you accurately calculate the amount of interest that is due on the invoices.
- As a project manager, you could use the DAYS360 function to calculate the number of days between the start and end dates of a project for billing purposes. This could help you determine the total number of days that will be billed for the project based on a 360-day year.
- As a student, you might use the DAYS360 function to calculate the number of days between the start and end dates of a semester for academic planning purposes. This could help you determine how many days you have available to complete assignments and study for exams based on a 360-day year.

Overall, the DAYS360 function can be useful in a variety of situations where you need to calculate the number of days between two dates based on a 360-day year.

## Limitations of DAYS360 Function

- One limitation of the DAYS360 function in Google Sheets is that it only calculates the number of days between two dates based on a 360-day year. This means that the function ignores the actual number of days in the year and treats every month as having 30 days. This can be useful for certain financial calculations, but it may not always provide an accurate result for other purposes.
- Another limitation is that the DAYS360 function only works with dates in the same format. For example, if one date is formatted as “MM/DD/YYYY” and the other is formatted as “YYYY-MM-DD,” the function will not work properly.
- Additionally, the DAYS360 function only works with dates that are within a certain range. If the dates you are trying to use are outside of this range, the function will return an error. The exact range may vary depending on the version of Google Sheets you are using, but generally it is between January 1, 1900 and December 31, 9999.

Overall, while the DAYS360 function can be a useful tool for calculating the number of days between two dates based on a 360-day year, it is important to be aware of its limitations and to use it carefully to ensure that the results are accurate.

## Commonly Used Functions Along With DAYS360

Here are some commonly used functions that can be used along with the DAYS360 function in Google Sheets:

- TODAY: This function returns the current date. It can be used as the start or end date in the DAYS360 function to calculate the number of days between the current date and another date based on a 360-day year. For example,
=DAYS360("1/1/2023", TODAY())

would return the number of days between the current date and January 1, 2023 based on a 360-day year.

- DATE: This function allows you to create a date by specifying the year, month, and day. It can be used as one of the dates in the DAYS360 function to calculate the number of days between a specific date and another date based on a 360-day year. For example,
=DAYS360("1/1/2023", DATE(2022, 12, 31))

would return the number of days between January 1, 2023 and December 31, 2022 based on a 360-day year.

- DATEDIF: This function calculates the difference between two dates in a specific unit of time, such as days, months, or years. It can be used to calculate the number of days between two dates more accurately, by taking into account factors such as weekends and holidays. For example,
=DATEDIF("1/1/2023", "1/1/2022", "d")

would return the number of days between January 1, 2023 and January 1, 2022, excluding weekends and holidays.

- NETWORKDAYS: This function calculates the number of working days (i.e., days from Monday to Friday) between two dates. It can be used to exclude weekends from the calculation of the number of days between two dates based on a 360-day year. For example,

=NETWORKDAYS(“1/1/2023”, “1/1/2022”)

would return the number of working days between January 1, 2023 and January 1, 2022 based on a 360-day year.

Overall, these functions can be useful when used in combination with the DAYS360 function to calculate the number of days between two dates in various ways based on a 360-day year.

## Summary

The DAYS360 function in Google Sheets is a useful tool for calculating the number of days between two dates based on a 360-day year. It has a simple syntax, DAYS360(start_date, end_date, [method]), where start_date is the earlier date, end_date is the later date, and method is an optional argument that determines how the function calculates the number of days. This function can be useful for financial calculations that use the 360-day year, such as calculating interest or other amounts.

However, it’s important to be aware of the limitations of the DAYS360 function. It only calculates the number of days based on a 360-day year, so it may not always provide an accurate result for other purposes. Additionally, the DAYS360 function only works with dates that are within a certain range, and the dates must be in the same format in order for the function to work properly.

Overall, the DAYS360 function can be a useful tool for calculating the number of days between two dates based on a 360-day year in Google Sheets. If you’re not already using it, we encourage you to try it out and see how it can help you in your own work.

## Video: DAYS360 Function

In this video, you will see how to use DAYS360 function. Be sure to watch the video to understand the usage of DAYS360 formula.