How to Use the DAYS360 Function in Excel

This guide explains how to use DAYS360 Function in Excel, including its syntax, required arguments, practical examples, and common errors.

Description: The function calculates the number of days between 2 dates, based on 360 days per year (from 12 months, 30 days per month). Useful function in calculating payments in the accounting system based on twelve months 30 days.

Syntax: DAYS (start_date, end_date, [method])

Inside:

- start_date: End date to calculate the number of days, is a required parameter.

- end_date: The start date to calculate the number of days, is a required parameter.

- method: A logical value that determines how the date is calculated, an optional parameter with the following values:

+ method = FALSE or skip -> calculate the number of days in US method (NASD). The end date of the month is the 30th day, if the end date is earlier than 30 days, the end date will be equal to the first day of the following month.

+ method = TRUE -> calculate the number of days in European method, the start date and end date of the month on the 31st of the month will equal the 30th day of that month.

Attention:

- If 1 of the 2 arguments end_date and start_date is outside the valid range of the day -> the function returns the #NUM! Error value

- If 1 of the 2 arguments end_date and start_date cannot be parsed into a valid date -> the function returns the #VALUE! Error value

For example:

Calculate the number of days between dates in the table below:

- In the cell to calculate enter the formula: = DAYS360 (F7, G7, H7).

- Press Enter -> return value is:

- Similarly copy the formula for the remaining value with method = False.

- Here the same value but different methods -> different values.

- Similarly copying the formula for the remaining values results:

Above are detailed instructions and some specific examples when using the DAYS360 function in Excel.

Good luck!