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SET TERM  ^^ ;
CREATE PROCEDURE P_TEST returns (
  TIME_START TimeStamp,
  TIME_STOP TimeStamp,
  TIME_NEEDED Numeric(18,9))
AS
/*
  Procedure: P_TEST

  Author   : FRANK
  Date     : 01.11.2008
  Purpose  : Various Tests or Data-Updates / Patches
  ------
*/
declare variable intTimeStart                     TimeStamp  ;
declare variable intTimeStop                      TimeStamp  ;
declare variable intTimeNeeded                    numeric(18,9) default 0 ;

declare variable intDoSomething                   Char(31) default '' ;

begin

   /* initial value when starting */
   intTimeStart = current_TimeStamp ;

   /* do something here to waist time */
   for
      select RDB$FIELD_NAME from RDB$FIELDS into intDoSomething
   do
   begin
      for
         select RDB$FIELD_NAME from RDB$FIELDS into intDoSomething
      do
      begin
      end
   end

   /* time on finished */
   intTimeStop  = current_TimeStamp ;

   /* total time needed */
   intTimeNeeded= (intTimeStop - intTimeStart) * 24 * 60 ; /* minutes */

   /* results */
   TIME_START = intTimeStart ;
   TIME_STOP  = intTimeStop ;
   TIME_NEEDED= intTimeNeeded ;

end
 ^^
SET TERM ;  ^^