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When specifying the parameters for CALL IS8601_CONVERT, the 'to-variable' restricts the length to 16 bytes. If a LENGTH statement specifies a longer length, a note is produced in the log like this:

   NOTE: Invalid argument to function IS8601_CONVERT at line n column n.

The documentation indicates that the variable must be at least a 16-byte character variable. This would imply that the variable's length can be longer, but currently it cannot be.

With the fix, the to-variable must be 16 or greater in length.

Operating System and Release Information

data test;
  start='01jan2010 00:00:00'dt;
  end='04mar2011 00:00:00'dt;
  length duration $18;  * <<<<<<<<<<<<<<<<<<<<<<<<< ; 
  call is8601_convert('dt/dt','du',start,end,duration);
  formatted=put(duration,$n8601b.);
run;