/* PROGRAM DOCUMENTATION BLOCK

PROGRAM: narr_new_date
  PRGMMR:  W. Ebisuzaki              ORG: W/NP52    DATE: 2003-12

ABSTRACT: 
  The program overwrites the date code on a grib file with the user specified value

Program History log:
   2003-12 W. Ebisuzaki based on earlier code

USAGE:

   % narr_new_date gribfile YYYYMMDDHH


INPUT FILES:
    grib file

OUTPUT FILES:
    grib file

SUBROUTINES CALLED:
    readgrib
    seekgrib

ATTRIBUTES:
   LANGUAGE: ANSI/ISO C

*/