%timestamp and %time

I am moving a date and a time to a timestamp field.

Why can't I use the timestamp BIF with the time BIF?:

          expTS = %timestamp(%time(expTime:*iso));
RNF0538E The first parameter for %TIMESTAMP is not valid.

Is this the best way to do it?:

           expTS = %timestamp(%date(expdat:*cymd));
           test(te) *iso expTime;
            if not %error;
      /end-free
     C     *iso          move      expTime       ISOTime
     C                   move      ISOTime       expTS
      /free
            endif;

Thanks,
Phil


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