I think this is the correct form of the date, for me. But if I wanted a DDMMYYYY_numb date format?
perl -pi -e 's/\x79\x79\x4d\x4d\x00\x00\x00\x00\x00/\x64\x64\x4d\x4d\x79\x79\x79\x79\x5f/g' /usr/lib/libqcamera.so.1.0.0