protected String a(String s,int v,String u) throws Exception {
  char sign=v >= 0 ? '+' : '-';
  Date dt=DateMathParser.parseMath(null,s + 'Z' + sign+ Math.abs(v)+ u);
  return fmt.format(dt.toInstant());
}

protected String a ( String s , int v , String u ) throws Exception { char sign = v >= 0 ? '+' : '-' ; Date dt = DateMathParser . parseMath ( null , s + 'Z' + sign + Math . abs ( v ) + u ) ; return fmt . format ( dt . toInstant ( ) ) ; }
macro : add : parses s , adds v u , fmts
