use filetime from json

fix_dir_dates.sh

@@ -2,7 +2,11 @@
 while read -r dir
 do
     echo "Checking dir '${dir}'..."
-    last_file="${dir}/$(ls -ht -- "${dir}" | head -n1)"
+    last_file="${dir}/$(ls -ht -- "${dir}/" | grep \.webm\.download_info\.json | head -n1)"
     echo "Last modified file is '${last_file}'"
-    touch -r "${last_file}" -- "${dir}"
+    filetime="$(jq '.info_dict.filetime' -- "${last_file}" )"
+    if [ "${filetime}" != "null" ]; then
+        last_file_time_formated=$(date -d "@${filetime}" +%Y%m%d%H%M.%S)
+        touch -t "${last_file_time_formated}" -- "${dir}"
+    fi
 done <<< "$(find . -mindepth 1 -maxdepth 1 -type d)"