About define Time of new nc file

Hello,everyone
      I want to use ncl to generate an 10 years averaged nc data from follow
input data :
     hgt.yyyy.nc ( yyyy are years number from 1998 to 2007) in which
hgt.2000.nc and hgt.2004.nc have 1464 times and the other have 1460 times
And i want a output file have 1464 times . And i write a ncl script to do it
, the script are attached as accessories . output file " hgt.mean.nc" have
1464 times , when i use
" ncdump -h hgt.mean.nc",it shows as follow:
dimensions:
 time = UNLIMITED ; // (1464 currently)
 level = 17 ;
 lat = 73 ;
 lon = 144 ;
variables:
 double Time(time) ;
  Time:units = "hours since 1800-1-1 00:00:0.0" ;
  Time:long_name = "Time" ;
  Time:_FillValue = -9999. ;
 int time(time) ;
 short hgt(time, level, lat, lon) ;
  hgt:units = "m" ;
  hgt:long_name = "Geopotential height" ;
  hgt:_FillValue = -999s ;
 float level(level) ;
  level:coordinate_defines = "point" ;
  level:axis = "z" ;
  level:GRIB_name = "hPa" ;
  level:GRIB_id = 100s ;
  level:positive = "down" ;
  level:long_name = "Level" ;
  level:actual_range = 1000.f, 10.f ;
  level:units = "millibar" ;
 float lat(lat) ;
  lat:coordinate_defines = "point" ;
  lat:axis = "y" ;
  lat:standard_name = "latitude_north" ;
  lat:long_name = "Latitude" ;
  lat:actual_range = 90.f, -90.f ;
  lat:units = "degrees_north" ;
 float lon(lon) ;
  lon:coordinate_defines = "point" ;
  lon:axis = "x" ;
  lon:standard_name = "longitude_east" ;
  lon:actual_range = 0.f, 357.5f ;
  lon:long_name = "Longitude" ;
  lon:units = "degrees_east" ;
}

but when i open hgt.mean.nc by Grads, and use " q file " , it shows as
follow:
File 1 :
  Descriptor: hgt.mean.nc
  Binary: hgt.mean.nc
  Type = Gridded
  Xsize = 144 Ysize = 73 Zsize = 17 Tsize = 1
  Number of Variables = 1
    hgt 17 -999 Geopotential height

How can i make the file "hgt.mean.nc" as NNRP2 file such as hgt.2000.nc.
especially how can i define time when i generate
the nc file "hgt.mean.nc" ?

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