Returns the fractional duration milliseconds of this field. In other words, calling remainder returns the duration that roundFloor would subtract.
For example, on a datetime of 2002-11-02T23:34:56.789, the remainder by hour is 34 minutes and 56.789 seconds.
@param instant the milliseconds from 1970-01-01T00:00:00Z to get theremainder
@return remainder duration, in milliseconds
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