breviation for
                          day of week.
   &quot;Wkd&quot;        string    capitalized three letter abbreviation for
                          day of week.
   &quot;wkd&quot;        string    lower case three letter abbreviation for
                          day of week.

   String Markers

      String markers are portions of the format picture that
      will be replaced with a character string representing the
      corresponding component of a time.

   Numeric Markers

      Numeric mark