Excel days 360 function 30-360 Days Count Convention The Gregorian calendar is the internationally accepted civil calendar. But due to different number of days in differentmonths makes it difficult towork on financial calculationsusing Gregorian calendar While working on FinancialModels it is easy to dealwith 30/360 days year as most of the financial,corporate & municipal institutions follow the same Gregorian calendar. (2010, March 16). In Wikipedia, The Free Encyclopedia. Retrieved 15:25, March 19, 2010, from http://en.wikipedia.org/w/index.php?title=Gregorian_calendar&oldid=350173459 Working with 30/360 Days with Excel In Excel it is very easy to work with 30/360 Days Count Convention Syntax:=DAYS360(START_DATE, END_DATE, [METHOD]) Where START_DATE is the first date and END_DATE is the last date of the period My date of birth is 7-Dec-1973 today’s date is 19-Mar-2010,follow theexample tounderstandthe same. Conclusion You can use Excel’s DAYS360 function to calculate difference in two dates This function will eliminate the confusion with Gregorian Calendar regarding different number of days in different months, even different number of days in leap years Syntax:=DAYS360(START_DATE, END_DATE, [METHOD]) Where START_DATE is the first date and END_DATE is the last date of the period References Gregorian calendar. (2010, March 16). In Wikipedia, The Free Encyclopedia. Retrieved 15:25, March 19, 2010, from http://en.wikipedia.org/w/index.php?title=Gregorian_calendar&oldid=350173459