Hi Jonas,
The attributes your reading in are strings so it needs some manipulation before you can add them up. This is a slightly adapted method of how I used to do this, its not entirely clean but it should work.
mm = stringtoint( str_get_cols(wind_u@initial_time,0,1) )
dd = stringtoint( str_get_cols(wind_u@initial_time,3,4) )
yyyy = stringtoint( str_get_cols(wind_u@initial_time,6,9) )
hh = stringtoint( str_get_cols(wind_u@initial_time,12,13) )
initial_time = cd_inv_calendar(yyyy, mm,dd, hh, 00, 00, "hours since 1800-01-01 00:00:00",0)
valid_time = initial_time + stringtoint(wind_u@forecast_time)
valid_time@units = initial_time@units
; Add to plot
res@gsnRightString = "Valid: "+cd_calendar(valid_time,-3) ; or cd_string if you want nicely formatted outputs
good luck.
Alan.
-------------------------------------
Alan Brammer,
PhD Student,
Department of Atmospheric and Environmental Sciences, University at
Albany, SUNY, Albany, NY, 12222
-------------------------------------
On Dec 12, 2012, at 10:16 AM, Jonas Kaufmann <jonas.kaufmann@gmail.com> wrote:
> wind_u@initial_time
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Received on Thu Dec 13 02:27:53 2012
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