Try s.th. like this :
 
setvar xd hpdate
setvar xm hpmonth
setvar xy hpyear
if !hpdate < 10 then
   setvar xd "0"+"!xd"
endif
if !hpmonth < 10 then
   setvar xm "0"+"!xm"
endif
continue
purge xx!xy!xm!xd > $NULL
copy file, xx!xy!xm!xd
 
Best regards, Andreas
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