YEARFRAC(start_date, end_date [,basis]) 
Returns the number of years as a decimal between two dates. 
start_date  The starting date. 
end_date  The finishing date. 
basis  (Optional) The type of day counting to use: 0 = US 30/360 (default) 1 = Actual/Actual 2 = Actual/360 3 = Actual/365 4 = European 30/360 
Remarks 
* All arguments are truncated to integers. * Dates may be entered as text strings within quotation marks, as serial numbers or as results of other formulas or functions. * If "start_date" or "end_date" are not valid dates, then #NUM! is returned. * If "start_date" can be a text string or a date serial number. * If "basis" is left blank, then 0 is used. * If "basis" is not an integer, it is truncated. * If "basis" < 0, then #NUM! is returned. * If "basis" > 4, then #NUM! is returned. * If "basis" = 0 (US 30/360), the calculation is based on 30 days in every month, divided by 360. * If "basis" = 1 (Actual/Actual), the calculation is based on the actual number of days in the month, divided by the actual number of days in the year. * If "basis" = 2 (Actual/360), the calculation is based on the actual number of days in the month, divided by 360. * If "basis" = 3 (Actual/365), the calculation is based on the actual number of days in the month, divided by 365. * If "basis" = 4 (European 30/360), the calculation is based on 30 days in a month, divided by 360. * You can use the DAYS360 function to return the number of days between two dates, based on 30 day months. * You can use the YEAR function to return the year as an integer given a date serial number. * In Excel 2003 this function was only available when you had the Analysis ToolPak addin loaded. * For the Microsoft documentation refer to support.office.com 

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