#!/system/bin/sh
#change timestamp for images filename IMG_YYYYMMDD_HHMMSS.jpg
for i in IMG_*.jpg
do
    touch -t ${i:4:8}${i:13:4}.${i:17:2} $i
done

#change timestamp for whatsapp images IMG-YYYYMMDD-WAnnnn.jpg
for i in IMG-*WA*.jpg
do
    touch -t ${i:4:8}1234 $i
done

#change timestamp for videos filename VID_YYYYMMDD_HHMMSS.mp4
for i in VID_*.jpg
do
    touch -t ${i:4:8}${i:13:4}.${i:17:2} $i
done

#change timestamp for whatsapp videos IMG-YYYYMMDD-WAnnnn.mp4
for i in VID-*WA*.jpg
do
    touch -t ${i:4:8}1234 $i
done