Set mp3 date tag as YYYY-MM-DD based on mtime
Particularly useful for large, poorly tagged radio archives mirrored with wget.
Processes files in the working directory matching the patters specified.
Requires: mutagen (for tagging)
for FILE in *.mp3; do mid3v2 --date=$(perl -e '@d=localtime ((stat(shift))[9]); printf "%4d-%02d-%02d", $d[5]+1900,$d[4]+1,$d[3]' $FILE) $FILE; done
