[gradsusr] Forecast hour and minutes

[Daniel Nairn]

Hello

I am running GrADS scripts that output images at hourly intervals. I would
like to change this to display at 30 minute intervals but I cannot see what
I need to change. This is my working hourly interval script example

'query time'
res = subwrd(result,3) ;
res1 = subwrd(result,6) ;
fcsthr = substr(res,1,3) ; fcstdate = substr(res,4,13) ; fcstday =
substr(res1,1,3)

I've tried modifying this but ended up with more characters displayed on
the hourly images trying to get the half hourly images working.

Any ideas?
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