declare
..............
    -- add by msr (second offset interval)
    step_sec interval;
    last_sec interval;
    --/
.............
begin
.....
    -- add by msr (second offset interval)
 
    nextrun:=date_trunc('second',nextrun);
 
   last_sec:=(COALESCE(to_char(date_trunc('second',jobnextrun),'ss'),'0')||' second')::interval 
    	FROM pgagent.pga_job 
        WHERE jobid=(SELECT s.jscjobid FROM pgagent.pga_schedule s
        							WHERE s.jscid=jscid);
 
    step_sec:= (COALESCE(to_char( date_trunc('second',jscstart),'ss'),'0')||' second')::interval ;
 
    IF extract('second' FROM step_sec)>0 then 
    	nextrun:=nextrun-interval '2 minute';
        nextrun:=nextrun+ (step_sec+last_sec) ;
    end IF;
 
    --/
--<< здесь RETURN nextrun;
end;