Rename Photos and Videos play online

This app aims to rename your photos and videos so that the filenames begin with the date of recording. That way, you can always sort your files chronologically, regardless of recording device and even after they've been duplicated or modified.

Background:
If you want to view your photos and videos in a chronological order within a gallery app, sorting by filename often doesn't work since photo filenames begin with "IMG_" or "PANO_" and videos with "VID_" or "MOV_" (depending on your device). Panoramas and videos will be shown last.
Sorting by EXIF date taken doesn't work either since videos don't contain EXIF data. They will be shown last (or first).
Sorting by filesystem's "date modified" usually works fine on the original device. But when you copy your files to another device, the date of copy will be the new "date modified", which disrupts the original chronological order of the files.

For these reasons, it makes good sense to rename your photos and videos with this app before transferring them to another device (smartphone, tablet or PC), so that all filenames begin with the date taken.

Features:
Rename your photos and videos using
date used in filename
file modification date
EXIF date (only photos, videos don't have one)
Add your own text at filename beginning or before file extension
Rename all photos and videos in a folder at once or choose individual files
3 operation modes:
Overwrite original files
Create copies with new names
Rename files and move them to another folder
Recognized date formats (in filenames):
IMG_YYYYMMdd_HHmmss.jpg (OnePlus 3T, LG Nexus 5 and many more)
MMddYYHHmm.mp4 (some LG devices)
many more
Write recognized dates in a short or a long format:
20170113_145833
2017-01-13 14.58.33
2017-01-13 14h58m33
Write years with four or two digits
Or define your own pattern (new in version 1.10.0)!
If your files are named like "CIMG1234.jpg" or "DSC-1234.jpg", rename them using the EXIF date (if available) or file modification date (if correct)
Correct wrong dates in filenames by adding/subtracting days, hours, minutes and/or seconds
Supported file formats: jpg/jpeg, png, gif, mp4, mov, avi, 3gp
Write access to external SD cards in Android 5 and newer (and in many cases also in Android 4.3 and older)