How batch mv files to folders created and named by modification date?

With perl:

perl -MPOSIX -le 'for (<*.jpg>) { $d=strftime"%Y-%m-%d",localtime((stat$_)[9]); mkdir$d;rename$_,"$d/$_" or warn "rename $_: $!\n"}' 

With zsh:

zmodload zsh/stat for f (*.jpg) {stat -F %F -A d +mtime -- $f && mkdir -p $d && mv -- $f $d} 

With OSX stat:

for file in *; do dir="$(stat -t %Y%m%d%H%M%S -f %Sm -- "$file")" mkdir -p "$dir" mv -- "$file" "$dir/$file" done 

With GNU stat (i.e. on Linux or Cygwin):

for file in *; do dir="$(stat -c %Y -- "$file")" mkdir -p "$dir" mv -- "$file" "$dir/$file" done 

This will move each file into a directory named with its mtime (as an epoch).

If you want finer grained control over how the directory looks, you can use GNU date to reformat it by changing the assignment line to something like this:

dir="$(date -d @"$(stat -c %Y -- "$file")" +%F)" 

See man date for information about date format specifications that you can use. In this case, %F is:

%F full date; same as %Y-%m-%d