Filter for embedding visible time codes

[MagnumPI]

I'm trying to help some non technical friends collect video evidence.  In order to do this we need to burn a continuously running date and time onto the video.  It seems like Avidemux should be able to do this, but I can't seem to find a the feature.  The PrintInfo filter in particular makes me think I'm on the right track here.  Anyone know how to do this?
Anyone know of a free windows tool?  It has to be super easy.  FFMPEG is not going to work for them.