DAYS360Returns the difference between two days based on the 360-day year used in some financial interest calculations.
DAYS360(start_date, end_date, [method])
start_date – The start date to consider in the calculation. Must be a reference to a cell containing a date, a function returning a date type, or a number.
end_date – The end date to consider in the calculation. Must be a reference to a cell containing a date, a function returning a date type, or a number.
method – [ OPTIONAL – 0 by default ] – An indicator of what day count method to use.
0 indicates the US method – Under the US method, if start_date is the last day of a month, the day of month of start_date is changed to 30 for the purposes of the calculation. Furthermore if end_date is the last day of a month and the day of the month of start_date is earlier than the 30th, end_date is changed to the first day of the month following end_date, otherwise the day of month of end_date is changed to 30.
Any other value indicates the European method – Under the European method, any start_date or end_date that falls on the 31st of a month has its day of month changed to 30.
This function is mostly used in a financial setting, for calculation involving fixed-income securities. Other usage is likely incorrect.
Ensure that the inputs to the function are either references to cells containing dates, functions which return date objects such as DATE, DATEVALUE or TO_DATE, or date serial numbers of the type returned by the N function. Google Sheets represents dates and times as numbers; while conversion is automatic when a human-readable date is entered into a cell, functions only accept literal dates in numeric format.
DAYS360 does not auto-convert number formats in the same way that Google Sheets does upon direct entry into cells. Therefore, DAYS360(10/10/2000,10/10/2001) is interpreted as DAYS360(0.005,0.00499750124938), the quotients of 10 divided by 10 divided by 2000 and 2001, respectively.
YEARFRAC: Returns the number of years, including fractional years, between two dates using a specified day count convention.
TO_DATE: Converts a provided number to a date.
N: Returns the argument provided as a number.
DATEVALUE: Converts a provided date string in a known format to a date value.
DATE: Converts a year, month, and day into a date.
Returns the difference between two dates using different method.