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$ cat tester
#!/bin/bash

file="filename_01012014"
touch $file
cp $file "${file%%_*}_"$(date -d"$(sed -r 's/(.{2})(.{2})(.{4})/\3\2\1/' <<<"${file##*_}") -15 days " +"%d%m%Y")


$ bash tester...

-delete is GNU find, is very fast.
Unix find needs -exec rm -f {} \; and some have the faster -exec rm -f {} +
--

find /path -type f -prune -name ...

does not descent to subdirectories if at...