The sample code below illustrates one way to compute the difference between two time variables, even when the latter is past  midnight.

data duration; 
input jobid $ start time8. finish time8. miscvar $; 
if finish lt start then duration=('24:00:00't-start)+finish; 
else duration=finish-start; 
datalines; 
J115 05:54:3308:23:33 ABCDUL 
J116 06:12:3410:12:22 ABCCBA 
J117 11:54:2211:33:22 ABCPAL 
J118 12:23:2214:24:34 ABCJAM 
J119 13:24:5413:55:22 ABCRAB 
J120 14:32:2214:54:12 ABCPAL 
J121 22:44:4106:55:22 ABCEBS 
;
run;

proc print; 
format start time8. finish time8. duration time8.;
run;

 

The results of PROC PRINT are below:

Obs    jobid       start          finish       miscvar      duration
   1     J115      5:54:33      8:23:33    ABCDUL      2:29:00
   2     J116      6:12:34    10:12:22    ABCCBA      3:59:48
   3     J117     11:54:22    11:33:22   ABCPAL     23:39:00
   4     J118     12:23:22    14:24:34   ABCJAM      2:01:12
   5     J119     13:24:54    13:55:22   ABCRAB      0:30:28
   6     J120     14:32:22    14:54:12   ABCPAL      0:21:50
   7     J121     22:44:41      6:55:22   ABCEBS      8:10:41