NC and ::RND allow you to control
      how the output time picture is rounded. If you specify
      ::TRNC all components of time are simply truncated to
      the precision specified by the marker and any modifier.
      If you specify ::RND the output time is rounded to the
      least significant component of the format picture. The
      default action is truncation.

      Whether an output time string should be rounded or
      truncated depends upon what you plan to do with the
      string. For exa