fix recurrence nanosecond handling for nanosecond values > 0.5 #1320
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This PR is a follow up to #1284: we missed the fact that
remainder(dividingBy:)can produce negative values if the input's fractional part is greater than 0.5. (eg:1.9.remainder(dividingBy: 1)is -0.1).Since the dates produced by
Calendar.DatesByRecurring.Iteratorall have their nanosecond component set to 0 (rather than being rounded to the nearest whole number), we need to usetruncatingRemainder(dividingBy:)instead.I also changed it to operate on
timeIntervalSinceReferenceDateinstead oftimeIntervalSince1970, since that saves us on having to perform thetimeIntervalSince1970computation every time.