Code:
     if EL2_Enable = 1 THEN     ;  EL2 = EL1 current values - set overrun value  

       EL2_100th   = EL1_100TH   - Event1_OT_100th+100
        if EL2_100th<100 then 
          EL1_Seconds=EL1_Seconds-1
       Else
         EL2_100th=EL2_100th-100
      endif

    EL2_Seconds = EL1_Seconds - Event1_OT_sec+60
      if EL2_Seconds<60 then 
        EL1_Minutes=EL1_Minutes-1
     else
       EL2_Seconds =EL2_Seconds -60
     endif

       EL2_Minutes = EL1_Minutes - Event1_OT_Min +60
     if EL2_Minutes<60 then
       EL1_Hours=EL1_Hours-1
     else
       EL2_Minutes =EL2_Minutes -60
     endif

       EL2_Hours   = EL1_Hours   - Event1_OT_hour+24
     if EL2_Hours<24 then
        EL1_Days=EL1_Days-1
     else
       EL2_Hours   =EL2_Hours   -24
     endif

  EL2_Days    = EL1_Days    - Event1_OT_Day  
       
endif
Just something to try