This bug, nad possible solution was reported by Ping Lou in the mailing list,
mail below.

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I think the implementation of the deadline policy may have some errors. I made
three changes to correct them. 

1. The first error is obvious. In gw_sch_conf_parser.l
DL_HALF was assigned to be the value of DL_WEIGHT. it should be 
DL_HALF              { lvalp->val_int = DL_HALF;           return VARIABLE;}

2. in gw_template_parser.l, add the current time to jt->deadline.
  jt->deadline += time(NULL);

3. in gw_scheduler_jobs.c, multipy C_half with 86400 (1 day)

C_half    = -1.5 * sched->sch_conf.dl_half * 86400;

After these changes, the deadline policy seems work.
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