fails:Time#strftime returns the fractional seconds digits, default is 9 digits (nanosecond) with %N
fails:Time#strftime with %N formats the nanoseconds of of the second with %N
fails:Time#strftime with %N formats the microseconds of of the second with %6N
fails:Time#strftime with %N formats the nanoseconds of of the second with %9N
fails:Time#strftime with %N formats the picoseconds of of the second with %12N
fails:Time#strftime with %z rounds fixed offset to the nearest second
