change a global attribute of a netcdf file

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Dear users
i use the following script to change values of global attributes in an existing netcdf file:
myfile=['spinCGRID.ncf'];
nc = netcdf(myfile,'write');
nc.SDATE = nclong(2007354);
endef(nc);
close(nc);
although this used to work for several times, now i am having problems with it, the script runs but no change happens in the netcdf file. is there anotherway to do this?
thank you

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