Days360: Excel Formulae Explained

by Jacky Chou
Updated on

Key Takeaway:

  • DAYS360 is an Excel function that calculates the number of days between two dates based on a 360-day year. This function is commonly used in financial and accounting calculations.
  • To use DAYS360 function in Excel, the syntax of the function must be followed, which involves inputting the two dates and choosing a method for counting days. An example of using DAYS360 function is calculating the number of days an investment is held.
  • The advantages of using DAYS360 function include its simplicity, ease of use, and compatibility with financial calculations. However, its use of a 360-day year may result in inaccurate calculations and it may not be suitable for all types of calculations.

Do you want to learn more about using DAYS360() in Excel? This guide will cover everything you need to know about Excel’s DAYS360() formulae, from how to use it to its benefits. You’re sure to become a pro in no time!

What is DAYS360 function in Excel

The DAYS360 formula in Excel calculates the number of days between two dates based on a 360-day year. It is commonly used for financial calculations, especially for interest calculations. It assumes that each month has 30 days and ignores the actual number of days in a month or leap years. To use the DAYS360 formula, simply enter the starting and ending dates as arguments. It is a useful tool for anyone working with financial data in Excel.

It’s important to note that the DAYS360 formula should be used with caution and only for specific situations where a 360-day year is appropriate. It may not provide accurate results for other types of calculations or for more precise timing needs.

A unique feature of the DAYS360 formula is that it can be used in conjunction with other financial formulas, such as PV and FV, to calculate interest amounts and other financial metrics.

According to Microsoft documentation, the DAYS360 formula is supported in all versions of Excel and can be found in the Date & Time category of the Formulas tab.

How to use DAYS360 function

To work with the DAYS360 function, you need to understand its parameters. This guide will help you use it effectively and efficiently. Syntax and an example of the function are provided.

Syntax of DAYS360 function

The Excel function for counting the number of days between two given dates, excluding weekends and holidays is a popular one among professionals. Here’s how to use this function in Excel, using a Semantic NLP variation of Syntax of DAYS360 Function.

  1. Begin by selecting the cell where you want to display the result.
  2. Type 'DAYS360' followed by an open parenthesis.
  3. Enter the first date in Cell A1 and the second date in Cell B1.
  4. Close parentheses and press Enter.
  5. The result will appear in the selected cell.

The formula syntax is "DAYS360(start_date,end_date,[method])". The method parameter allows you to specify which version of the 360-day calendar you want to use.

In addition, this function can also be used to calculate interest payments under a 360-day year, effectively ignoring leap years in interest calculations.

Historically, financial institutions have used this function as a standard for calculating interest rates on loans and mortgages before switching to actual/365 methods for accuracy reasons.

Using DAYS360 function is like living in a leap year forever, minus the extra day of fun.

Example of using DAYS360 function

To illustrate the implementation of DAYS360 function, we present a practical example in this section.

  1. Begin by opening a new Excel sheet and selecting cell A1.
  2. Enter the start date of the period you want to calculate, followed by a comma and then the end date.
  3. Type in “,” and specify whether you want to count days inclusive or exclusive of these dates. For instance, “False” counts them as exclusive.
  4. Type in the function name (DAYS360).
  5. Parenthesize your calculation as demonstrated with an “equal” sign initially.
  6. Lastly, hit enter and view the result displayed.

It is worth noting that this formula approximates to 360 days in a year while ignoring any remainder from actual days in a month.

Another essential aspect to keep in mind while using this function is that it does not consider leap years. Accordingly, February is still considered with 30 days irrespective of when it falls.

To obtain optimal results when applying this formula, ensure that your data entries are precise and complete. Further consider using adequate formatting techniques like adding borders or highlighting cells with specific patterns like boldface or colored text to enhance readability.

Using DAYS360 function may save time, but it also saves you the joy of manually counting the actual number of days – cheers to automation and laziness!

Advantages and disadvantages of using DAYS360 function

Evaluating DAYS360 function in Excel? Pros and cons to consider!

  • Easy to use – The DAYS360 function is relatively easy to use and doesn’t require any advanced skills in Excel.
  • Useful in financial modeling – The function is particularly useful in financial modeling when calculating the number of days between two dates.
  • Consistent results – The function provides consistent results regardless of the year or month.


  • Not always accurate – The DAYS360 function assumes that there are 30 days in every month, which is not always accurate. This can lead to errors in certain situations.
  • May require adjustments – In some cases, adjustments may be needed to accurately calculate the number of days between two dates using this function.
  • Limitations – The DAYS360 function has limitations and may not be suitable for all calculations.

Explore the advantages and disadvantages to expand understanding of its limitations. Weigh up the pros and cons to decide if it’s right for you.

Advantages of using DAYS360 function

The functionality of DAYS360 within Excel deserves attention for its multiple positive attributes.

  1. DAYS360 function is immensely helpful in financial calculations as it helps in the calculation of interest accruals for a 360-day year, irrespective of the actual number of days in a given month.
  2. The formula helps to simplify and ease complexity while computing accrued interest on loan or investment instruments that follow similar conventions, allowing for easy comparison and analysis.
  3. Using DAYS360 also facilitates quicker computation while saving time as several steps can be consolidated into one single step.
  4. It is often used by finance professionals globally, which makes it an industry-standard tool.

Furthermore, as this function’s benefits are noteworthy, it should be included in one’s arsenal when working with financial data.

Interestingly, Did you know that the European Union uses DAYS360 as their calculation method for bond interests? Thus ensuring uniformity and aiding in speedy settlement.

Disadvantages of using DAYS360 function

The use of DAYS360 Excel function has several drawbacks that one must be aware of before implementing it in their financial calculations or accounting systems.

  • It does not provide an accurate calculation of the number of days between two dates as it assumes that each month has only 30 days.
  • It does not consider the impact of leap years, thus making calculations less precise.
  • The results obtained from using this function may vary based on location and regional settings, leading to inconsistencies across platforms and machines.
  • It is limited in its scope as it can only be used for a specific type of calculations and does not cater to more complex scenarios.
  • It may lead to errors if not used correctly, especially when combining different functions or formulas within an Excel sheet.
  • Its use may also require additional effort in terms of data validation and cleaning to ensure data integrity.

In addition, users should be aware that there are alternative functions available in Excel that can perform similar tasks with more precision and accuracy. For instance, using the DATE function could help avoid some of the inaccuracies inherent in DAYS360.

To minimize the drawbacks associated with the use of DAYS360, users should follow some best practices, such as carefully validating inputs and cross-checking results with other functions or sources. Additionally, they should explore alternative formulas provided by Excel or seek guidance from experts in the field.

Five Facts About DAYS360: Excel Formulae Explained:

  • ✅ DAYS360 is a function in Microsoft Excel used to calculate the difference between two dates based on a 360-day year. (Source: Excel Easy)
  • ✅ The function is commonly used in accounting and financial calculations, specifically to calculate interest on bonds or other financial instruments. (Source: Corporate Finance Institute)
  • ✅ The DAYS360 function assumes that every month has 30 days, which may not accurately reflect the actual number of days in a month. (Source: Investopedia)
  • ✅ The function takes two arguments: the start date and end date of the time period being measured. (Source: Ablebits)
  • ✅ The DAYS360 function can also calculate the number of days between two dates using the European method, which considers the actual number of days in each month and does not count the end date. (Source: Excel Tips)

FAQs about Days360: Excel Formulae Explained

What is DAYS360: Excel Formulae Explained?

DAYS360 is an Excel formula that calculates the number of days between two dates based on a 360-day year. This formula can be useful for calculating interest on loans or bonds.

How do I use the DAYS360 formula in Excel?

To use the DAYS360 formula in Excel, you need to specify two dates as arguments. The first date should be the earlier date, and the second date should be the later date. You can enter these dates either as cell references or as explicit dates enclosed in quotation marks. For example, the formula =DAYS360(A2,”12/31/2020″) would calculate the number of days between the date in cell A2 and December 31, 2020, using a 360-day year.

Can I use the DAYS360 formula with a different year basis?

By default, the DAYS360 formula assumes a 360-day year, but you can use the formula with different year bases by specifying an additional argument. For example, the formula =DAYS360(A2,”12/31/2020″,TRUE) would calculate the number of days between the date in cell A2 and December 31, 2020, using a 365-day year.

What is the difference between DAYS360 and DATEDIF?

The DAYS360 formula calculates the number of days between two dates based on a 360-day year, whereas the DATEDIF formula calculates the difference between two dates in days, months, or years. The DATEDIF formula is more flexible, but the DAYS360 formula can be useful in certain financial calculations.

What is the maximum number of days that the DAYS360 formula can calculate?

The maximum number of days that the DAYS360 formula can calculate is 360 times 99, which equals 35,640. If the difference between the two dates is greater than this amount, the formula will return an error value.

Can I use the DAYS360 formula to calculate business days?

No, the DAYS360 formula calculates the number of days between two dates based on a 360-day year, regardless of whether those dates fall on weekends or holidays. To calculate business days, you can use the NETWORKDAYS or WORKDAY functions in Excel.

Auther name

Jacky Chou is an electrical engineer turned marketer. He is the founder of IndexsyFar & AwayLaurel & Wolf, a couple of FBA businesses, and about 40 affiliate sites. He is a proud native of Vancouver, BC, who has been featured on Entrepreneur.comForbesOberlo, and GoDaddy.