Let's say I want the files for 2 January, 2025...
touch -t 202501030000.00 /tmp/from$$
touch -t 202501032359.59 /tmp/to$$
find . -name "file.subfile.P\*.lastfile" -mnewer /tmp/from$$ -molder /tmp/to$$ -print | xargs echo "Processing files: "
rm /tmp/{from,to}$$