Make your GPX anonymous

Sometimes I want to make my .gpx files anonymous because it's data that I recover by myself using OSMTracker for Android and I don't want the whole world knows when I was there.

Yeah, maybe I'm a bit crazy. Nice to meet you ;)

Today, I found [1] a real simple solution for this: xmlstarlet

Once you have it installed, you can excecute:

xmlstarlet ed \
   -P \
   -N x=http://www.topografix.com/GPX/1/1 \
   -u '//x:time' \
   -v 1970-01-01T00:00:00Z \
   input.gpx > output-nulltime.gpx

And what will put 1970-01-01T00:00:00Z on all the <time> tags.

That's all! Now, they are ready to be uploaded to the OSM community and nobody will know where you was there :)