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Assuming a 90 year spell includes 22 leap years, the number of days is equal to (68 x 365) + (22 x 366) = 24820 + 8052 = 32872 days. If the 90 year spell includes 23 leap years, the number of days is equal to (67 x 365) + (23 x 366) = 24455 + 8418 = 32873 days. 3 people found this useful.
It is for applications that require 53 week years because the last few days of the year still occur in a calendar year (government reporting or payroll support would be good examples). 2002 is a good example of a 53 week year. (you can actually get a 54th week by this definition-this formula will also work then).