Plot with Time in yyyymmddhh format

Hello,
I have a GRIB data where the unit of time is "hours since 1800-01-01 00:00".
I have converted this to a UT-referenced date using the function ut_calendar
.When I plot this using * gsn_csm_pres_hgt, *I am getting the plot with time
in the x axis in "hours since 1800-01-01 00:00" unit. How do I change this
to UT-referenced data?

Thanks & Regards,
Satheesan

The summary of the data gives

Variable: x
Type: float
Total Size: 286704000 bytes
            71676000 values
Number of Dimensions: 4
Dimensions and sizes: [initial_time0_hours | 44] x [lv_ISBL1 | 25] x
[g0_lat_2 | 181] x [g0_lon_3 | 360]
Coordinates:
            initial_time0_hours: [1823664..1823922]
            lv_ISBL1: [1..1000]
            g0_lat_2: [90..-90]
            g0_lon_3: [ 0..359]
Number Of Attributes: 10
  center : European Center for Medium-Range Weather Forecasts - Reading
  long_name : Temperature
  units : K
  _FillValue : -999
  level_indicator : 100
  gds_grid_type : 0
  parameter_table_version : 128
  parameter_number : 130
  forecast_time : 0
  forecast_time_units : hours

My code is like this
--------------------------------------------------------------------------------------------------
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"

begin
f = addfile ("temperature.grb", "r")
v = f->T_GDS0_ISBL

    v!0 = "time"
    v!1 = "levl"
    v!2 = "lat"
    v!3 = "lon"

  time = f->initial_time0_hours
  TIME = ut_calendar(time,-3)
  delete(v&time)
  v&time = TIME

    v1=v(:,:,{-73},{347})
    v2=v1(levl|:,time|:)
  wks = gsn_open_wks ("eps", "w-mara")
  gsn_define_colormap(wks,"cosam12")

  res = True

  res_at_cnFillOn = True
  res_at_cnLinesOn = False
  res_at_lbLabelAutoStride = True
  res_at_tmYRTickSpacingF = 1
  res_at_cnLevelSelectionMode = "ExplicitLevels"
  res_at_cnLevels = fspan(220,270,9)
  res_at_cnFillColors = (/2,4,5,7,8,9,10,12,11,13/)

  plot = gsn_csm_pres_hgt (wks,v2,res)
end
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Received on Mon Aug 04 2008 - 09:57:06 MDT