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 formats a time with fixed offset as '+/-HH:MM:SS' with '::' specifier
fails:Time#strftime with %z rounds fixed offset to the nearest second
