A class that implements several of the date math functions. They all take two arguments. The first is a DateTimeAttribute or a DateAttribute (as the case may be) and the second is a DayTimeDurationAttribute or a YearMonthDurationAttribute (as the case may be). The function adds or subtracts the second argument to/from the first and returns a value of the same type as the first argument. If either of the arguments evaluates to indeterminate, an indeterminate result is returned.
@since 1.0
@author Steve Hanna
@author Seth Proctor
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