The Excel DAYS360 function returns the number of days between two dates based on a 360-day year. Calculations based on a 360-day year comes from certain accounting calculations where all 12 months are considered to have 30 days.
Get days between 2 dates in a 360-day year
A number representing days.
=DAYS360 (start_date, end_date, [method])
start_date - The start date.
end_date - The end date.
method - [optional] The type of day count basis to use. FALSE (default) is US method, TRUE is European method.
FALSE - (default) - US method. when the start date is the last day of the month, it is set to the 30th day of the same month. When the end date is the last day of the month, and the start date < 30, the end date is set to the 1st of the next month, otherwise the end date is set to the 30th of the same month.
TRUE - European method. Starting dates and ending dates equal to the 31st of a month are set to the 30th of the same month.
The Excel NETWORKDAYS function calculates the number of working days between two dates. NETWORKDAYS automatically excludes weekends (Saturday and Sunday) and can optionally exclude a list of holidays supplied as dates.