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Formal compliance means that the software conforms to the criteria for implementation compliance and a formal proof exists that the following date operations anywhere in the software are equivalent to those in DateBench:

 

determination of leap year

conversion from a Gregorian date to day of the year

conversion from day of the year to Gregorian date

comparison of dates

determination of the day of the week

adding or subtracting days to a date

subtracting a date from another date.