Built-in functions inside text_io

I am using text_io to get dir information. When inside the loop built-in functions such as to_date are not working. It is simply ignoring the function. However if I put a simply message box, it works.
Is there a limitation to using functions inside text_io.
Also, any code, including message boxes, outside text_io exit loop is ignored. Is there something I can do to fix it?
Thanks,
Srikanth

But if I want to compare 2 dates, I cannot assign it to variables. I need to something like
If to_date(a) - to_date(b) > 0 then
else
end if;
This is not working inside text_io. Any ideas?
thanks

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