Maybe I'm not doing something right but it didn't seem to work.
I used
{lwmain.date_rept} >= dateadd("d", -datediff("d",{?START DATE}, {?END DATE}), {?START DATE}) and {lwmain.date_rept} <= {?END DATE};
{lwchrg.ucr_code}="23F" AND {lwmain.zone} IN ["Z1","Z2","Z3","Z4","Z5","Z6","Z7","Z8"]
in...