it is possible, but there's no built in format for your trtDate field, so you'd have to build your own function to convert it to a recognisable format...
insert a module, make a function which parses your trtDate as input (a mix of left(), mid(), right() and dateserial() will easily convert that to a proper date), and then return the date value.
if you make the function public, and give it a unique name, then you can call it directly in your saved query...
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Procrastinate Now!