Correcting timestamp on photographs taken on an Acer Android phone

I have an Acer Liquid E phone running Android. All of the photographs it takes are timestamped in the internal EXIF metadata to 8 December 2002. Turns out there's a bug in the camera app: it seems that instead of using "insert correct date here" in libcamera.so somehow the December 2002 date got hardcoded in.

The timestamp on the file itself is correct, however, so I wrote this script to use that to edit the EXIF times. It uses ExifTool, which is probably in your package manager:

#!/bin/bash

for I in 2002-12-08*jpg
do
  TIMESTAMP=`stat --printf "%y" "$I"`
  NAME=`echo "$I" | sed 's/2002-12-08 12.00.00-//'`
  NAME="acer-$NAME"
  echo "$I --> $NAME ($TIMESTAMP)"
  cp -p "$I" $NAME
  exiftool -P -DateTimeOriginal="$TIMESTAMP" -CreateDate="$TIMESTAMP" $NAME
done

For example, a file named 2002-12-08 12.00.00-460.jpg timestamped 2012-04-10 19:30 would have the DateTimeOriginal and CreateDate EXIF fields corrected to to 2012-04-10 19:30 and the file would be renamed to acer-460.jpg. The original file is left untouched.

It worked for me, and it won't delete your files, so use it if it helps. Make sure that whenever you copy files off your Acer phone you use cp -p to preserve the original timestamp. Otherwise your photos will have their internal dates set to today!