in reply to (OT) In Korne Shell Script - Finding modified File List after the chosen date...
This isn't a perl question, but your issue is easily fixed.
Change your find to
the 'mc' at the end of newer means that you are looking for the last 'M'odified time compared to the 'C'reation date/time of the file you give it.find "$dir" -type -f -newermc /tmp/timestamp
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